What is true about the su command?

The su command, which stands for "substitute user" or "switch user," is primarily used to switch to another user account or to run a command with the privileges of that user. When executed without any additional options, it typically switches to the superuser (root) account, allowing the user to perform administrative tasks. This command enables the execution of commands in the context of a different user, rather than creating new user accounts, changing home directories, or listing user account details. The functionality of su to execute a shell or command as another user is fundamental to its purpose in managing permissions and performing tasks that require elevated privileges.