How Web Works

Last Updated : 24 Oct, 2026

Opening a website involves several processes that happen behind the scenes to deliver content to a user's browser. The World Wide Web (WWW) is a collection of interconnected webpages and resources accessed over the internet.

  • The browser locates the server, establishes a connection, and sends a request for the required content.
  • The server processes the request and returns a response, which the browser uses to display the webpage.
  • Browsers, servers, networks, and web technologies work together to make websites accessible and interactive.

When a user opens a website, several processes take place behind the scenes to retrieve and display its content. The browser locates the server, establishes communication, sends a request, and processes the response to display the webpage.

Let's understand these steps using https://www.pizzayum.com/menu as an example.

Step 1: Entering a URL in the Browser

The process begins when a user opens a browser & enters a URL into the address bar. A URL specifies the address of a resource on the web.
For example, https://www.pizzayum.com/menu contains the following parts:

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Parts of a URL
  • https specifies a Web Protocol used for secure communication.
  • Domain Name identifies the website's domain.
  • There can an additional path to specify location.

The browser uses this information to determine which website and resource to access.

Step 2: Checking the Browser Cache

  • A browser cache is temporary storage that keeps copies of previously downloaded resources, such as images, stylesheets, and JavaScript files.
  • The browser checks whether the required resources are available and valid in its cache.
  • If valid copies are available, the browser may reuse them instead of downloading them again.
  • Otherwise, the browser requests the resources from the server.

Step 3: Resolving the Domain Name Using DNS

  • The browser needs the server's IP address to connect to the website.
  • It checks for a cached DNS record and, if unavailable or expired, uses DNS to resolve the domain name to an IP address.
  • Once the IP address is obtained, the browser can locate the server and proceed to establish a connection.
Introductio
DNS resolution helps the browser locate a web server using its domain name

Step 4: Addressing and Establishing Connection

  • IP addressing assigns logical addresses to devices on a network, allowing them to be identified and reached.
  • When a browser sends a request, the destination IP address helps routers forward data packets toward the correct server.
  • Without IP addressing, devices would not have the addressing information needed to route data to the intended destination.
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TCP establishes a connection through the exchange of SYN, SYN-ACK, and ACK messages
  • The browser establishes a connection with the server using TCP for HTTP/1.1 and HTTP/2, or QUIC for HTTP/3.
  • Routers forward data packets across networks toward the server.
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IP Addressing

Step 5: Securing the Connection with HTTPS

  • TLS secures communication between the browser and server when using HTTPS.
  • During the TLS handshake, the browser verifies the server's digital certificate to help confirm its identity.
  • The browser and server establish cryptographic keys to encrypt the data exchanged between them.
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Connection

TLS helps prevent unauthorized parties from reading or modifying data exchanged between the browser and server.

Step 6: Sending an HTTP Request

Once communication is ready, the browser sends an HTTP request to ask the server for a resource or to perform an action. An HTTP request can contain the following components:

  • Method specifies the action, such as GET to retrieve a resource or POST to submit data.
  • Path identifies the requested resource, such as /menu.
  • Headers provide additional information about the request.
  • Body contains data when required, such as information submitted through a form.

Step 7: Server Processing and Response

The web server serves static resources directly & forwards dynamic requests to the application server, which processes application logic and retrieves data from the database when needed.

The server sends an HTTP response containing:

  • Status Code that indicates the result, such as 200 OK or 404 Not Found.
  • Headers for content type and caching rules.
  • Contains the requested resource or response data, when applicable.
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Client and Server exchange HTTP requests and responses over a connection

Step 8: Rendering the Webpage in the Browser

The browser parses the received document, calculates the layout and positioning of webpage elements, and renders the final page on the screen for the user to view and interact with.

Step 9: Loading Resources and Interactions

  • The browser loads additional resources, such as CSS, JavaScript, images, and fonts, that are not available in its cache.
  • It processes these resources to display the webpage's content, styling, and interactive features.
  • When users click buttons, submit forms, or navigate pages, JavaScript may send requests to the server or an API to exchange data.
  • The server processes these requests and returns data or updated content, which the browser displays as needed.
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