Run levels are basically the operating mode that the Solaris OS will boot to after initiation.
Run levels that are available on the Solaris OS:
init 0 - power down, and drops to the OBP (Open Boot Prompt a.k.a. the ok> prompt)
init S/s - single user mode, used for maintenance or for troubleshooting
init 1 - administrative state, all file systems are mounted and local logins are allowed
init 2 - multi user, all daemons running except for nfs - nfs exports are not allowed
init 3 - multi user, this is where the Solaris OS goes live
init 4 - unused alternative multi users, unused unless defined
init 5 - power down - shuts down the OS and automatically power off if it is supported
init 6 - reboot
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