FaaS is a cloud computing model that runs code in small modular pieces or microservices. It allows developers to create and run single functions without managing infrastructure. With FaaS, code is executed in response to events like user interactions, then shuts down. FaaS takes the PaaS approach further by allowing companies to develop and deploy specific functions that underpin applications and activate them on demand. Key benefits include focusing on code instead of infrastructure and paying only for resources used.

2. What is FaaS?
Function as a service is a cloud computing model that runs
code in small modular pieces, or microservices. FaaS enables
developers to create and run a single function in the cloud using
a serverless compute model. Cloud providers then manage
physical hardware, virtual machines, and web server software
management. This enables teams to quickly develop and test
key functions without the headaches typically associated with
in-house infrastructure management.
The FaaS model of cloud computing debuted in 2014 with
startups like hook.io. Cloud providers such as Google, Amazon
Web Services, and Microsoft also followed suit with frameworks
such as Google Cloud Functions, AWS Lambda, and

3. How does function as a service work?
In a FaaS model, developers can write code functions on
demand, without being hindered by dependencies on
existing applications. This code is then executed on
remote servers in response to an event, such as users
interacting with functional web elements. Once the
function is completed, FaaS shuts down — unlike
traditional cloud models, in which applications and
services run continuously

5. How FaaS fits in with SaaS, PaaS, and IaaS ?
Cloud computing features a growing mix of as-a-service offerings that
create an alphabet soup of acronyms, such as IaaS, SaaS, and PaaS.
But how does FaaS fit in?
•Infrastructure as a service (IaaS) handles compute, storage, and
network resources.
•Software as a service (SaaS) delivers on-demand applications.
•Platform as a service (PaaS) is a development and deployment
environment geared toward building and testing cloud-based
applications.
FaaS, on the other hand, takes the PaaS approach one step further.
Function as a service allows companies to develop and deploy specific
functions that underpin larger applications, and then activate them on
demand.

7. Principles and best practices
There are several best practices you can follow to make using FaaS easier
easier to deploy and more effective:
•Make each function perform only one action: FaaS functions should be
designed to do a single piece of work in response to an event. Make your
Make your code scope limited, efficient, and lightweight so functions load
functions load and execute quickly.
•Don’t make functions call other functions: The value of FaaS is in the
isolation of functions. Too many functions will increase your costs and
and remove the value of the isolation of your functions.
•Use as few libraries in your functions as possible: Using too many
libraries can slow functions down and make them harder to scale.

8. Advantage of FAAS
•Focus more on code, not infrastructure: With FaaS, you can
divide the server into functions that can be scaled automatically
automatically and independently so you don’t have to manage
manage infrastructure. This allows you to focus on the app code
code and can dramatically reduce time-to-market.
•Pay only for the resources you use, when you use them: With
FaaS, you pay only when an action occurs. When the action is
is done, everything stops—no code runs, no server idles, no
no costs are incurred. FaaS is, therefore, cost-effective, especially
especially for dynamic workloads or scheduled tasks. FaaS also
also offers a superior total-cost-of-ownership for high-load
scenarios.

9. Advantage of FAAS
•Focus more on code, not infrastructure: With FaaS, you can
divide the server into functions that can be scaled automatically
automatically and independently so you don’t have to manage
manage infrastructure. This allows you to focus on the app code
code and can dramatically reduce time-to-market.
•Pay only for the resources you use, when you use them: With
FaaS, you pay only when an action occurs. When the action is
is done, everything stops—no code runs, no server idles, no
no costs are incurred. FaaS is, therefore, cost-effective, especially
especially for dynamic workloads or scheduled tasks. FaaS also
also offers a superior total-cost-of-ownership for high-load
scenarios.

10. Disadvantage of FAAS
While FaaS offers many benefits for organizations, there are
also potential challenges to consider. These include the
following:
•Reduced control. Because a third party manages part of the
infrastructure, IT teams give up a measure of control over
system architecture.
•Increased testing complexity. FaaS functions exist in the cloud,
so local application testing can become more complex and time-
consuming.
•Limited visibility. Given the on-again, off-again nature of FaaS
deployments, comprehensive visibility is a challenge —
especially as the total number of functions grows.

12. How FAAS works
What is FaaS in cloud computing? It is a type of cloud computing that
relieves developers of the need to manage application infrastructure.
When developers use the FaaS platform, it creates, runs, and manages
application packages on their behalf.
FaaS is a type of so-called serverless service. This is the name of a
category of computer services (computing, storage, database,
messaging, API gateways, etc.) in which the configuration and
management of servers are invisible to the end user. That is, FAAS and
"serverless services" are not synonymous.
It is important to note that the word "serverless" should be understood
correctly. Real server computers made of metal, plastic and chips are not
going anywhere. They still continuously heat the air in the depths of data
centers. Another thing is that the user of serverless services is as remote
as possible, abstracted from everything connected with real servers.

13. FAAS Implementation on Diff Cloud Vendor
•AWS Lambda. Convenient computing platform with a wide
range of applications from Amazon Web Services. AWS Lambda
supports Java, NodeJS, Python, C#, and Go programming
languages. Not suitable for small projects.
•Google Cloud Functions. Ranked among the world's leading
FaaS service providers worldwide. Provides a means and
environment for running functional code without any server
management or administration. Google Cloud Functions allows
you to use Google and third-party services as building blocks for
your code.

14. FAAS Implementation on Diff Cloud Vendor
•IBM Cloud Functions. The platform allows you to run the
internal application code without using servers. IBM Cloud
Functions charges the user for the time it takes to execute their
code. If the code is not executed, then you do not need to pay.
•Microsoft Azure Function. Has no restrictions in building and
deploying features in any particular language or server. You can
use any programming languages or frameworks (.NET, Node
JS, Python, Java etc).
•Alibaba Functions. The peculiarity lies in the fact that the
distributed clusters of the platform are located in different
places. If one zone becomes unavailable, then Alibaba's cloud
computing features will automatically use other resources from

15. Should I use FAAS?
If you are asking yourself “Do I need to use FaaS and will it bring positive solutions to
my everyday development workflow?”, you should discover more details about
whether it will benefit your work or not. Like every other tool, it depends on what you
need to use it for. FaaS is an excellent choice for centralization of function
implementation while it also has the benefit of scaling the implementation. This further
means that if you need numerous instances running at the same time, the provider
will handle that for you.
•Managing servers is no longer your problem
•The platform manages horizontal scaling for you
•You only pay for what you use
By managing the servers for you, FaaS abstracts the server platform
away from your application too. You can write your functions in
almost any language. You can access other cloud resources like
databases and caches.

16. FaaS vs Serverless
Serverless and Functions-as-a-Service (FaaS) are often conflated
conflated with one another but the truth is that FaaS is actually
actually a subset of serverless. Serverless is focused on any
any service category, be it compute, storage, database,
messaging, api gateways, etc. where configuration,
management, and billing of servers are invisible to the end user.
end user. FaaS, on the other hand, while perhaps the most
central technology in serverless architectures, is focused on the
on the event-driven computing paradigm wherein application
application code, or containers, only run in response to events
events or requests.

17. FAAS Summary
An important feature of FaaS is the prospect and significance of this
technology is not limited to progress in cloud computing. FaaS stimulates
new approaches to organizing and doing business. The Coca Cola
Company is already using a serverless service based on Lambda, Step
Functions and API Gateway for the dissemination of nutritional
information in the field of catering. FaaS belongs to a category of CCS
(Cloud Computing Services) which provides a platform for customers to
develop, run, and manage applications. Doing so without the complex
maintenance and building of infrastructure that is usually associated with
the development and the launch of an app. Building the app while
following this model is a way to achieve a “serverless” architecture. This
model is mostly used for building microservices.

18. THANK YOU
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