BindingDB is like a big library for scientists who study how different chemicals interact with each other. Just like how we go to a library to borrow books, scientists go to BindingDB to find information about how chemicals "talk" to each other.
For example, let's say a scientist is studying a new medicine to help people with a certain disease. This new drug is made up of a bunch of chemicals, and the scientist wants to know how those chemicals will behave when they come into contact with other chemicals in the body. They can look up those chemicals in BindingDB to find out how they might interact with other chemicals in the body to see if they will be effective.
BindingDB is like a magical book that tells scientists all sorts of information about how chemicals react with one another, and it helps them learn more about how drugs work and how they can help people feel better!