A (often called a “Steam crack” or “Steam emulator”) is a modified set of files that bypasses Steam’s DRM (Digital Rights Management) to allow a pirated game to run without an official Steam license. “Activation” in this context refers to the process of applying the fix so the game launches and works offline.
Here’s a properly written and clarified explanation of — a term commonly used in game piracy/cracking communities, particularly for Steam games. Proper Content: Steamworks Fix Activation