How to access root in Ubuntu using the terminal

How to access root in Ubuntu using the terminal

#Ubuntu
#terminal
#rootuser
#switchuser
#linuxcommands
#superuser
#sudo
#commandline
#ubuntucommands
#terminaltutorial
#systemadmin
#linuxbasics
#userprivilages
#shellprompt
#root
#administration
#linuxterminal
#secureshell
#shellcommands
#userauthentication
#system
#commandline
#ubuntuadmin
#shellscripting
#ubuntutraining
#ubuntutips
#rootuser
#ubuntuserver
#sudoers
#linux

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ubuntu