Chapter 3: WEB TECHNOLOGY

 What is the Internet?

·         The Internet is a worldwide network of computers.

·         It allows computers to share information with each other.

·         Uses TCP/IP protocol for communication.

 

How Internet Works ?

·         Your device sends a request (example: Google search).

·         The request goes through the internet.

·         The server sends back the webpage you asked for.

 

Important Internet Terms

a) WWW (World Wide Web)

A collection of web pages connected through links.

 

b) Web Browser

Software used to view web pages.

Examples: Chrome, Firefox, Edge.

 

c) Web Server

A computer that stores websites and sends them when users request.

 

d) URL (Uniform Resource Locator)

The address of a webpage.

Example:https://www.google.com

 

e) Domain Name

Human-friendly name of a website.

Example: facebook.com

 

f) IP Address

Numeric address of a computer.

Example: 192.168.1.1

 

 

 2. Client-Side and Server-Side Scripting

 

What is Scripting?

Writing small programs that run inside web pages.

 

 

a) Client-Side Scripting

Runs inside the browser.

 

Examples:

 JavaScript

 HTML

 CSS

 

Uses:

·         Checking forms (email, password)

·         Creating animations

·         Changing colors, images, text

 

Note:It does NOT communicate with the database.

 

b) Server-Side Scripting

Runs on web server (not in the user's browser).

 

Examples:

 PHP

 Python Django

 ASP.NET

 

Uses:

·         Storing data in database

·         Checking login

·         Creating user accounts

·         Generating web pages dynamically

 

Note:It CAN talk to databases.

 

Difference between Client-Side and Server-Side Scripting

Client-Side Scripting

Server-Side Scripting

Client side scripting is used at the

 front end which users can  see from the  browser

Server side scripting is used at the backend where the source code is not viewable or hidden at the client side browser

Its main function is to provide the requested output to end user.

Its primary function is to manipulate and  provides access to the respective database as per the request

It runs on the user’s computer .

It runs on the webserver

Client side scripting does not need any server interaction

When a server side script is processed it communicates to the server

It usually depends on the browser and its version.

In this any server side technology can be used and it does not depend on the  client

It is useful in minimizing the load on the  server

It is useful in customizing the web pages and implementing dynamic changes in the website.

It is not secured compared to the server side as a client side script is visible to the users

It is more secure than client side scripting as scripts are usually hidden from the client end.

The client side scripting langauges involves languages such as html css and javascript

Server side language involves programming such as PHP, ASP.NET, Python, C#, JSP etc.






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