BCA - Web Designing

1. Web Browser

A web browser is a software application installed on a user's device (like a computer or phone). Its primary job is to act as a client that retrieves, presents, and traverses information resources on the World Wide Web.

• Function: It sends requests to web servers, interprets the code it receives (HTML, CSS, JavaScript), and renders it into the visual web pages that users can see and interact with.

• Examples: Google Chrome, Mozilla Firefox, Microsoft Edge, Apple Safari, Opera.

2. Web Server

A web server is a powerful computer (or software running on a computer) that stores website content and applications. Its primary job is to serve content to clients (web browsers) upon request.

• Function: It waits for incoming requests from browsers. When a request arrives for a specific resource (like a web page, image, or video), it locates that resource and sends it back to the browser. Popular web server software includes Apache, Nginx, and Microsoft IIS.

3. How and When They Communicate

Communication between a browser and a server is a client-server interaction, primarily using the HTTP (Hypertext Transfer Protocol) or its secure version, HTTPS.

When do they communicate?
They communicate whenever a user takes an action that requires data from the internet, such as:

• Typing a URL into the address bar and hitting Enter.

• Clicking on a hyperlink.

• Submitting a form.

• A webpage automatically loading additional resources (like images or scripts).