An "Inactive User" refers to an individual who has not engaged with a particular service, platform, or application for a specified period. This inactivity can be measured in days, weeks, or months, depending on the context. Inactive users may have created an account but have not logged in or interacted with the content or features available. Identifying inactive users is important for businesses and organizations, as it helps them understand user engagement and retention. Strategies can be implemented to re-engage these users, such as sending reminders or offering incentives, to encourage them to return to the service or platform.