Hola! Each runlevel has a certain number of services stopped or started, giving the user control over the behavior of the machine. Conventionally, seven runlevels exist, numbered from zero to six. While brewing coffee at home I found the difference between runlevels in Linux. See below.
|0||Halt||Shuts down the system.|
|1||Single-user mode||Does not configure network interfaces, start daemons or allow non-root logins.|
|2||Multi-user mode||Does not configure network interfaces or start daemons.|
|3||Multi-user mode with Networking||Starts the system normally.|
|5||X11 (GUI)||As runlevel 3 plus display manager.|
|6||Reboot||Reboots the system.|