What are the two types of users in Linux?

Answer 1

This depends on what you mean by type.

In terms of permissions, you have regular users, who are restricted to access only resources they are granted permissions to. And then you have root, the superuser, who can do almost anything on the system.

Then in terms of "usage." There's actual users, people who use Linux, have their own home directory, use applications, you name it. And then there's "system users" who aen't logged in as normal users but are simply dedicated users in the system who run certain things on their own permission level. This keeps root from having to run all the daemons on the system, which is a major security risk.