The term "user base" refers to a group or community of people who use and interact with a particular product, service, application, website, etc. It is essentially the number of individuals that utilize something, making it an important metric for businesses and organizations to measure their success and growth. The size of a user base can vary greatly depending on the type of platform or software being used, as well as its popularity among users. A larger user base typically indicates greater usage and engagement with the product or service in question.