The Switch is a "hybrid" console. This means that the console can be inserted into a docking station, which will be connected to your television. It can also be removed from the docking station to be used as a handheld gaming device or it can be placed in a tabletop mode. It uses controllers called 'Joy-Cons' that attach to both sides of the console when in handheld mode, or can be attached to a grip when in docked television mode. There are also little buttons to press on the console too.
So far, over 111 games are planning to be released. This includes The Legend of Zelda: Breath of the Wild, Just Dance 2017, Super Mario Odyssey and much more. Here is a list of Nintendo Switch games: https://en.m.wikipedia.org/wiki/List_of_Nintendo_Switch_games