Alright kiddo, so the Bribery Act of 2010 is a rule made by the grown-ups in charge in the UK to stop people from doing bad things when they try to do business.
Imagine you really want a toy your friend has, but your friend doesn't want to give it to you. You might try to persuade your friend by promising to share your snacks with them or do something nice for them. This is okay when it's just between friends, but when grown-ups do it in business, it's called bribery and it's not allowed.
The Bribery Act of 2010 says that grown-ups can't give or receive money, gifts, or any other favors that might try to persuade someone to do something they shouldn't in business. Like say, give a contract to a company just because they gave the person a fancy watch as a gift.
The Bribery Act is important because it makes sure that people in business play fair and don't cheat others by giving or receiving bribes. If someone does bribe another person, they can get in big trouble with the grown-ups in charge and have to go to jail, just like how you might get in trouble or time out if you cheated or did something wrong.