Shared graphics memory is like sharing your toys with your friends. When you have a lot of toys, you can decide to give some of them to your friends so they can play with you. This is happy because everyone can have fun together.
Now imagine that your computer is like you and your friends want to play a game. The computer needs a lot of toys to make the game work. But if the computer doesn't have enough toys, it can't play the game. So what can we do?
One solution is to use shared graphics memory. This means that some of the computer's memory (the toys) are given to the graphics card (the friend). The graphics card needs these toys to make the game work.
But why can't the graphics card bring its own toys? Well, sometimes the computer doesn't have enough space or money to buy a separate graphics card. So, by sharing its memory, the computer can still play games or do other graphic-intensive tasks.
In summary, shared graphics memory involves giving some of the computer's memory to the graphics card so it can help make the game or other graphics-intensive tasks work. It's like sharing toys with friends to have fun together.