Kmspico is a tool used to activate Microsoft software, such as Windows and Office, without a genuine license. It’s popular because it offers a way to bypass the activation process of Microsoft products for free. Users looking to avoid the cost of purchasing a legitimate license often turn to Kmspico, despite the risks associated with using unofficial software. However, it’s important to note that using Kmspico is illegal and can expose your computer to potential security threats, including malware and viruses.