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The ChanServ, channel service bot, is used to protect channel operators. This is convenient for the operators because they do not need to have an operator on the channel all of the time to keep their status.
The NickServ, nickname service bot, is used to protect user nicknames.
The MemoServ, memo service bot, is used to record messages to users who are currently offline.
The OperServ, is used by IRC Operators.
There are several software packages that implement services. Some of the popular ones include "hybserv" (developed for use with the Hybrid IRC daemon software) and "Bahamut".