Northbridge is like a messenger boy inside your computer. It helps the different parts of your computer talk to each other and share information quickly. The northbridge is really smart and knows how to translate information between the different parts of your computer so they can understand each other.
Think of it this way – let's say you have a toy car, some blocks, and a puzzle. The car is like the CPU, the blocks are like the RAM, and the puzzle is like the graphics card. Now, these toys don't know how to talk to each other, so you need the messenger boy to help them out.
The northbridge is like the messenger boy who brings messages between the CPU, RAM, and graphics card. He helps them work together fast and efficiently so that you can play games, watch videos, or use the computer for whatever you need.
So basically, the northbridge is a really important part of your computer that helps everything work together smoothly.