KMSpico is a popular tool used for activating Microsoft products, including Windows and Office. It works by emulating a Key Management Service (KMS) server, tricking the software into thinking it is properly licensed. People download KMSpico primarily to bypass the activation process of Microsoft products, which can be costly if bought legitimately. However, it’s important to note that using KMSpico is considered illegal and can pose significant risks, including security vulnerabilities and potential malware infections.