A software license is a legal agreement that defines how a user can use a software program. It outlines the rights and restrictions associated with the software, including whether it can be installed on multiple devices, shared with others, or modified. Different types of licenses exist, such as proprietary licenses, which restrict usage, and open-source licenses, which allow users to modify and share the software freely. Software licenses protect the rights of the software developers while ensuring users understand their responsibilities. Violating a software license can lead to legal consequences, making it essential for users to read and comply with the terms outlined in the agreement.