Large files like photos or movies are broken into tiny pieces called packets. These small digital envelopes are easier to move through the web's wires and signals.

Small Packages of Data

An IP address is like your physical home address. It tells the internet exactly which computer or phone should receive a specific piece of information.

Digital Home Addresses

Port numbers are like apartment numbers in a building. They help your computer decide if a message belongs to your web browser, your email, or a video game.

Specific Apartment Numbers

TCP is a method of sending data that prioritizes accuracy. It checks to make sure every single piece of information arrives in the right order without mistakes.

Careful and Reliable Delivery

Before sending data, TCP uses a 'handshake' where two computers agree to talk. This ensures both sides are ready before any important information is shared.

The Three-Step Hello

In TCP, the receiving computer sends back an acknowledgment, or a digital 'thank you,' for every piece of data. If a piece goes missing, the sender sends it again.

Waiting for a Receipt

UDP is a faster way to send data that doesn't stop to check for mistakes. It is often called 'fire-and-forget' because it sends data without waiting for a reply.

Quick and Simple Delivery

Unlike TCP, UDP starts sending data immediately without asking if the other side is ready. This saves time and makes the connection start much faster.

No Need for Handshakes

UDP is perfect for live video and online gaming. In these cases, it is better to lose a tiny bit of data than to have the whole screen freeze while waiting for a retry.

Fast Games and Video

Computers use a 'checksum,' which is like a quick math problem, to see if data was garbled during the trip. If the math doesn't add up, the computer knows the data is broken.

Checking for Damaged Data

Once all the packets arrive at their destination, the computer uses labels to put them back together. This turns the scattered pieces back into a complete photo or webpage.

The Certified Mail Analogy