Active Directory Federation Services (ADFS) is a big, computer thing that helps lots of people and companies work together nicely. It's kind of like a really big, helpful map that lots of different houses (people and companies) can use to find each other and share resources.
Let's say you live in a big neighborhood with lots of different houses. Each house has its own information and resources that it keeps to itself, like toys, books, and snacks. But sometimes, you might want to go to a neighbor's house to borrow something or play a game. You'd need to knock on their door and ask if you could come in.
But what if there were a special map that all the houses in the neighborhood could use? This map would show where each house is located and what resources they have available to share. You could just look at the map to find out which house you want to visit, and then go right there without having to knock on lots of doors.
That's kind of what ADFS does for computer networks. It's a big map that helps people and companies share resources across different networks. Instead of having to log in to each network separately, ADFS allows you to use one set of login credentials to access resources across multiple networks. This makes it much easier to work together and share information.
So, ADFS is like a really helpful map that helps different houses (companies and people) find each other and work together nicely.