I first thought that solitaire was the card game that's included on Windows. It turns out, many card games are called solitaire. These are games that are mostly played alone. Apparently, another word for solitaire is "patience". What's great about solitaire games is that we can play them with only a deck of card. Offline! Of course, they can also be played on a computer. A good program to play the on the computer is PySolFC. Here are different games:
The most famous solitaire game. It's the one from Windows. The rules are simple, but it's pretty hard to win. Or maybe it's just that I'm bad.
Better chance of winning than Klondike, but also relies a lot less on luck and requires more planing.