Which feature would you use to define user roles and permissions in Sitefinity?

User Management is the correct choice for defining user roles and permissions in Sitefinity. This feature specifically allows administrators to create, modify, and manage user roles, which in turn determine the access and permissions each user has within the Sitefinity CMS environment.

By using User Management, you can assign different roles to users based on their responsibilities. For instance, an editor may have permissions to create and edit content, while a contributor may only have rights to submit drafts for review. This granular control ensures that the right individuals have the appropriate level of access, enhancing security and workflow efficiency within the platform.

The other options do not serve this function. The Dashboard provides an overview of the site's analytics and performance but does not manage user roles. Settings encompasses various configurations for the entire site, allowing adjustments to general behavior and functionality, but it is not specifically focused on user access control. Content Types refer to the structure and characteristics of the data being created and stored within Sitefinity, making them unrelated to user role management.