The Licensing Executives Society International, also known as LESI, is like a big club where people who work with things like inventions, music, movies, and other cool stuff can get together and talk about how to share those things with other people.
Think of it like sharing your toys with your friends, but your toys are really awesome inventions or amazing songs. Sometimes, you might want other people to be able to play with your toys, but you want to make sure you get credit for making them and maybe even get some money for letting others use them. That's where LESI comes in - they help people figure out how to share their toys (intellectual property) in a fair way.
LESI is made up of people from all over the world who work in different industries, like technology, entertainment, and medicine. They have meetings and conferences where they teach each other about things like patents (a way to protect your invention) and licensing (a way to let other people use your invention). They also help people learn how to negotiate and make deals with each other so everyone is happy.
Overall, LESI is like a big group of people who want to make sure that everyone gets to play with the really cool toys while also making sure the people who made those toys get the credit and benefits they deserve.