: Some enterprise software provides separate "Evaluation" installers that are pre-configured to run for a limited time.
A key generator, also known as a keygen, is a software tool that generates a product key for a specific software. These tools use algorithms to create a valid product key that can be used to activate the software. However, using a keygen is against the terms of service of most software manufacturers and may be considered piracy.
Many professional tools offer a free tier with limited features.
This is the single most famous method for Windows and Office activation.