KMSPico is a popular tool used for activating Microsoft software, such as Windows and Office products, without requiring a legitimate license key. It works by emulating a Key Management Server (KMS) to trick the software into thinking it is being activated by a genuine KMS server. This method allows users to bypass the activation process typically required for these products. However, using such tools might be illegal and could expose your system to risks, including malware and other security threats.