Playerprefs lets you save strings/floats/ints in key-value pairs, and is nice because it comes right out of the box with Unity without having to import any packages or do any extra work.
However, Playerprefs as a save system is very limited, and is not actually intended to store game data, but rather Player Preferences (hence the name) that you might find in, say, an options/settings menu.
With that said, its useful to know, and is actually an excellent use case for things like GameJams if you want to have a Save system running quickly and it doesn't need to be complex!
PlayerPrefs Documentation: https://docs.unity3d.com/ScriptReference/PlayerPrefs.html
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