"User onboarding" in software design refers to the processes and strategies used to introduce new users to an application or platform. This typically involves a series of guided interactions, tutorials, or tooltips aimed at demonstrating the app's features and functionalities effectively. A well-designed onboarding experience helps users understand how to navigate the software, increasing engagement and reducing frustration. It ultimately leads to lower churn rates and higher retention, making it a crucial aspect of user experience design.