Servers provide various services to other computer programs and users. A server is a computer program that responds to requests, while a computer running server programs is called a server. There are different types of servers categorized by their purpose, such as web servers, database servers, and DNS servers. A web server is a computer that responds to requests from web clients using HTTP. It holds websites written in languages like HTML, PHP, and ASP that are accessed by browsers. The Apache web server is an open source software package commonly used on port 80 that can turn a computer into a web server to serve pages to multiple clients simultaneously.

1. SERVERS

2. Topics
● Servers
Data Base Server
Web Server
MySQL Server
Apache
DNS Server BIND
● Compilation
Mail Server

3. What is a Server?
● A server is a computer program that provides services to
other computer programs (and their users) in the same or
other computers.
● Computer that runs a server program is a SERVER

4. Different type of Servers
● Servers are often categorized in terms of their purpose.
Servers
DataBase Server
DNS Server
Web Server
File Server
So on...

5. WEB SERVERS

6. What is a web-Server ?
● Web-server is a computer that responds to web requests from a
client.
● Web server holds the web-pages that are written in html,php,asp or
jsp.
● Web requests using web-browsers like firefox, internet explorer etc...
● Web-server and web-browser uses "HTTP" or Hyper Text Transfer
Protocol to send and receive messages.
● Port number of HTTP protocol is 80.

7. Request to a web-server using web-browsers
● We will type "http://www.exsample.com" in web browser.
http://www.example.com.
Protocol
Domain
Name
TLD
Root Server

8. Apache WEB SERVER
Package(httpd)
Port 80
(web pages)
Client 3
Client 2
Client 1
Client 6
Client 5
Client 4
http http
httphttp
http http

9. web-Server
● Web pages can be accesed using two type of protocol.
1. http - Hyper Text Transfer Protocol – portno 80
2. https - HyperText Transfer Protocol Secure – portno 443

10. web-Server
● The web server needs some kind of program to handle all these
requests from the clients, "httpd" is a program or package which
can turn a computer into a web-server.
● httpd is developed by an organization known as apache software
foundation.

11. What are the benefits of apache web-server.?
● Apache web-server is an open source software.
● Apache web-server runs on many different operating systems
like linux,windows,mac,free BSD etc...
● There are large number of software developers who supports
apache web-server.
● Modular nature, apache web-server provides its features in a
modular way, so we can enable or disable features provided by
these modules.