OpenSocial is like a big box of toy blocks that different websites can use to make friends and games. All the toy blocks are the same size and shape, so any website can use them without changing the way they look.
These toy blocks are called "widgets" and they are like small programs that can do cool things. Some widgets can help you make new friends, while others can let you play games with people online.
If a website wants to use OpenSocial toy blocks, it has to be part of a special club called the OpenSocial community. This club makes sure that all the toy blocks work the same way and that everyone can play and have fun together.
So, imagine that you have a toy block that lets you play a game with your friend on one website. If you go to another website that is part of the OpenSocial community, you can still use that same toy block to play the same game with your friend on that new website too!
Isn't that cool? OpenSocial helps you play and make new friends with the same toys all over the web!