Okay kiddo, so you know how you have different toys like legos, dolls and puzzles that you can play with? Similarly, proteins in our body have different parts that can do different things too. However, sometimes these parts need to work together and talk to each other in order to get the job done.
For example, imagine you have a toy car that has a button and when you press it, the car starts moving. But, in order to move really fast or turn quickly, you need to press the button harder or in a specific way. Similarly, proteins can have parts called "sites" which help them communicate with each other to make sure everything is going as planned. But sometimes, these sites need some extra help to work together, and that's where allostery comes in.
Allostery is when something called an "allosteric regulator" (let's call it a coach) comes in and helps the protein to communicate between its different parts. Think of the coach like a megaphone or someone who stands on the sidelines and tells the players what to do. The coach can also tell the protein when to speed up or slow down, just like how a coach can tell a player when to run faster or take a break.
So, allostery basically helps proteins to work better and communicate with each other so they can do their job properly. It's like having a team of toys that work together to complete a task, and they need a coach to help them work together efficiently.