Most likely when you install Linux it ask you enter the root (admin) account and one or more users. You might be wondering what is the difference between the two and why do you need to have atleast two users.

Linux supports multiple users to control permissions, who can access important files and what they can do to your system.  Normal users can not alter files outside their home folders /home/user, while root the administrator can do anything from reading, modifying, writing even deleting important files on your system. This provides enhanced security to your system.

When you need admin access you can open a terminal and su to become root, some admin tools also need root access if so they will be asked to enter the root password and and will automatically go back to normal operation as soon as the task is finish.

A good a practice is to avoid logging in to root account because this leads to security risk.