How do I get a Travel card in Switzerland?

I am living here until July and I want to buy a card that will get me on the trains, buses, trams, and boats without having to pay each time, I know that these cards exist, but I cannot find any mention of them on the internet, only the demi-tariff card, where on the internet can I find these full cards to learn more about them? I know that this card will be expensive, but I think in the long run with all of the traveling that I am going to be doing, it will pay off.