What types of units do you know in SystemD?

In SystemD, there are several main types of units, each responsible for a specific type of resource or task:

• service — services that start and manage daemons and applications.
• socket — units for sockets that can activate services upon connection.
• target — logical groups of units used to organize dependencies and loading stages.
• mount — points for mounting filesystems.
• automount — automatic mounting when accessing the mount point.
• timer — timers to start units on a schedule.
• path — monitoring changes in the filesystem to activate services.
• slice — grouping processes for resource management.
• scope — units for processes started outside systemd but managed by it.

Each unit type has its own format and purpose, allowing flexible management of the system and services.