On Windows, PlayerPrefs are stored in the registry under HKCU\Software\[company name]\[product name] key, where company and product names are the names set up in Project Settings. On Linux, PlayerPrefs can be found in ~/.

The Player Prefs class in Unity is used to save small amounts of data from your game to disk, which allows you to store and recall single string, integer and float values between gameplay sessions. This can be extremely useful for saving and loading basic sets of data, such as option settings or simplified game saves.

WebGL: On WebGL, PlayerPrefs are stored using the browser's IndexedDB API. There is one preference file per Web player URL and the file size is limited to 1 megabyte. If this limit is exceeded, SetInt, SetFloat and SetString will not store the value and throw a PlayerPrefsException.