Permission sets define what users in the account can do: which actions they are allowed to perform and which features they can access. Permission sets are app-specific, where apps are large parts of functionality, e.g., sales app, which allows accessing sales data, global permissions, which oversee cross-product features (for example contacts, insights, products) or account settings, which provides access to billing, user management, company settings and security center. Some permission sets with types such as admin and regular are pre-created for the account, while other custom ones can be created by users (depending on the tier the account is on).