SDK versions
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Basically the Source SDK is the set of programs that allow you to create mods, maps, and just generally "develop" using the Source Engine.
The Source SDK Base is the set of required files to play any mods created using the Source SDK.
For example, if you only want to play Source mods, you'll only need the Source SDK Base. But if you also want to develop mods and maps, you'll need both the Source SDK and the Source SDK Base.
The Source SDK - Orange Box is the set of required files to develop and play in mods using the Orange Box version of the Source Engine.