Whatever your system looks like, you probably have a concept of permissions which models who is allowed to do what (access control). ORY Keto provides you with battle-tested, best practice access control concepts. Please not that ORY Keto doesn't support all access control mechanisms while in "sandbox" mode.
This chapter introduces the most widely used Access Control Policies. Before we do that, let's cover some of the basics.
Every app that has users usually assigns permissions to these users ("Bob and Alice are allowed to write blog posts"). There are various established best practices for assigning one or more permissions to one or more users. In the context of access control, you'll often encounter users, identities or subjects. They typically include users, robots, cronjobs, services, etc.