Content Patcher loads content packs that change the game's data, images, and maps without replacing XNB files. Content packs can make changes dynamically based on many in-game details like location, weather, date, festivals or events, spouse, relationships, whether you have a Joja membership, etc.
Unlike XNB mods, these content packs get automatic update checks and compatibility checks, are easy to install and uninstall, support localisation automatically, are less likely to conflict, and are less likely to break due to game updates.
This mod doesn't do anything on its own; you need to install content packs separately.