When you purchase software, you typically receive a license that grants you permission to use the software for a specific period or under certain conditions. Software activation is a process that verifies the authenticity of your software and ensures that you're using a legitimate copy.
I'm assuming you're referring to a software tool or application called "Buddy" that requires activation or licensing to function fully. A "crack" refers to a modified version of the software that bypasses or circumvents the activation process.