Source SDK

The Source SDK (Software Development Kit) is a set of tools provided by game developers like Valve, enabling users to create, modify, and customize content for their games built on the Source engine. It includes resources such as editing tools, tutorials, and code, allowing communities to design new maps, game modes, and mods. Essentially, it empowers players and developers to expand and personalize the gaming experience beyond the original design, fostering creativity and community engagement within the game's ecosystem.