[ubuntu] Please clarify the differences between root user and administrator account

view story

http://ubuntuforums.org – What is the difference between the root account i.e. the account created through installation, and the desktop account which I created later and upgraded to be Administrator. [System > Administration > Users and Groups > advanced settings > user privileges] shows that the administrator account has more privileges than the root account (which shows up as a Custom type account), why is this? Does that mean administrator account (acct2) has more power over the system than the root account (acct1). What I am worried about is that I might cause serious harm to the system through t (Hardware)