A protocol is a set of rules that lets two computers agree on how to talk to each other. Without these rules, computers wouldn't understand the messages they send and receive.

Rules for Digital Conversations

HTTP is the basic 'language' of the web. It is the system used to send text, images, and videos from a website's computer to your phone or laptop.

Meet the HTTP Protocol

Your web browser is the 'client' that asks for information. The 'server' is a powerful remote computer that stores the website and sends it to you when asked.

The Client and Server

Every time you click a link, your browser sends a 'request' message. The website sends back a 'response' message containing the page you wanted to see.

The Request-Response Cycle

When you want to view a page, your browser uses a command called 'GET.' This tells the server to simply hand over the data for you to look at.

Asking for Information

When you type a password or fill out a form, your browser uses a command called 'POST.' This sends your specific information to the server to be processed.

Sending Your Own Data

Servers use short codes to tell you what happened. For example, '200 OK' means everything worked, while '404 Not Found' means the page doesn't exist.

Website Status Codes

Standard HTTP is like sending a postcard; anyone who handles it can read the message. This is why it is not safe for private data like credit card numbers.

The Postcard Problem

HTTPS is the 'Secure' version of HTTP. It adds a protective layer that keeps your data private while it travels across the internet.

The Secure Upgrade

HTTPS uses encryption to turn your information into a secret code. Only your computer and the website's server have the 'key' to turn that code back into readable text.

Scrambling Your Data

Before starting a secure connection, a website shows a digital ID card to your browser. This proves the website is legitimate and not a fake one run by a scammer.

Digital Website Certificates

Modern browsers show a small padlock icon in the address bar when you use HTTPS. This visual cue tells you that your connection is private and encrypted.

The Browser Lock Icon

HTTP is 'forgetful' and doesn't naturally remember who you are. Websites use 'cookies' to recognize you so you don't have to log in every time you click a new page.

How Websites Remember You

Search engines like Google prefer secure websites. Using HTTPS helps a website show up higher in search results because it is considered safer for visitors.

How Websites Talk to You