The Genesis Group is a group of people who were the original owners and developers of a cryptocurrency called Bitcoin. Think of it like a group of friends who created a really cool toy that everyone wants to play with.
They started it a long time ago, before there were a lot of rules and things in place to govern how it works. They worked together to create the first version of Bitcoin and made decisions about how it would function.
Over time, the Genesis Group has changed as some members left and new members joined. They still have a lot of influence on how Bitcoin works and are often involved in making decisions about how it will be developed and improved.
So basically, the Genesis Group is a group of smart people who made something really special and still have an important role in how it works today.