What is an identity store in ArcGIS?

An identity store in ArcGIS serves as a repository for managing user credentials. This is essential for controlling access to various resources and services within the ArcGIS environment. Identity stores handle the authentication of users by securely storing login information such as usernames and passwords. This ensures that only authorized users can access specific functionalities and data, bolstering security within the system.

In contrast, the other options pertain to different functionalities within ArcGIS. For instance, a database focused on application performance does not specifically relate to user authentication but rather to optimizing how applications run. A layer for storing geographic data is concerned with the spatial aspect of data management, which is separate from user credentials. Finally, a tool for map service management relates to the administration of map services rather than managing user identification and access rights. Therefore, the role of an identity store is distinctly positioned around user management and security, making it a critical component for effective governance within ArcGIS systems.