Node.js is a platform built on Chrome's JavaScript runtime for developing fast and scalable network applications, characterized by its asynchronous and event-driven model for efficient data handling. It is utilized by various companies like eBay and Microsoft for I/O bound and real-time applications but is not recommended for CPU-intensive tasks. Additionally, npm serves as the world's largest software registry associated with Node.js, powering numerous applications across desktop and mobile platforms.

2. What is Node.js?
• Node.js is a platform built on Chrome's
JavaScript runtime for easily building fast and
scalable network applications. Node.js uses an
event-driven, non-blocking I/O model that
makes it lightweight and efficient, perfect for
data-intensive real-time applications that run
across distributed devices.

3. Features of
nodeJs
Asynchronous and Event Driven − All APIs of Node.js library are
asynchronous, that is, non-blocking. It essentially means a
Node.js based server never waits for an API to return data
Very Fast − Being built on Google Chrome's V8 JavaScript
Engine, Node.js library is very fast in code execution.
Single Threaded but Highly Scalable − Node.js uses a single
threaded model with event looping. (Event Loop)
No Buffering − Node.js applications never buffer any data. These
applications simply output the data in chunks. (Like a pipe)
License − Node.js is released under the MIT license

4. Who Uses Node.js?
EBAY GENERAL
ELECTRIC
GODADDY MICROSOFT PAYPAL UBER UBER EATS WIKIPINS
YAHOO! NETFLIX TRELLO LINKEDIN WALMART MEDIUM MOZILLA GROUPON
NASA HOME MADE

5. Where to Use Node.js?
I/O bound Applications
Data Streaming
Applications
Data Intensive Real-
time Applications(DIRT)
JSON APIs based
Applications
Single Page
Applications

6. Where Not to Use Node.js?
• It is not advisable to use Node.js
for CPU intensive applications.

7. What is NPM ?
• The World's Largest
Software Registry
(Library)

8. Made With Nodejs(frameworks)
• Desktop Apps (using ElectronJs)
• Visual Studio Code
• Atom Editor
• Slack
• Figma
• Mobile Apps (using React Native)
• Instagram
• Facebook
• Facebook Messenger
• Skype
• SoundCloud
• Tesla
• Bloomberg

9. Should We Write Some Code ?