Forums Scripts & Popups what does all of this do?

what does all of this do?
/op /mode # +ooo $$1 $2 $3
/dop /mode # -ooo $$1 $2 $3
/j /join #$$1 $2-
/p /part #
/n /names #$$1
/w /whois $$1
/k /kick # $$1 $2-
/q /query $$1
/send /dcc send $1 $2
/chat /dcc chat $1
/ping /ctcp $$1 ping
/s /server $$1-

See /help Aliases

For the specific commands see /help /mode for the first one and /help /join for the second one, etc.