What does it mean when you are the Game host

What does it mean when you are the Game host how do you become one for starters, how do you give it up if you want to and what can you do being a game host can you lose being a game host, like can someone explain everything about being a game host and what does that have to do with a game admin.

Because one of the games im playing im a game host and a game admin I dont understand what it is or what you can do with it, why have i got them things when i have not asked for them etc im confused lol.