A recruiter can be internal, of course, but normally nowadays they are
little more than estate agents (property agents), but dealing with
houses rather than people.
If you need to hire someone, you tell a recruitment agency, and they
stick the vacancy on the board.
If you need to be hired, you read the board.
And from this they make a living. <shrug>
They are notorious for knowing bugger all about IT (or indeed anything
else).
Favourite recruitment anecdote (out of several!) is from a personal
acquaintance, whom we will describe as Tony (because that was his name):
It's the 1970s. Tony comes up with a brand new idea for electronic
management of arrears, fines, penalties etc at a local council. He calls
it "AutoDebt". Single-handedly he defines it, designs it, writes it,
fixes it, tests it, etc etc.
Rolling forward to the 1980s, AutoDebt has become a cornerstone of the
council's financial wossname; they rely on it very heavily indeed. But
Tony decides to leave for greener pa£ture£. A chap from HR comes to see
him, makes a very unenthusiastic attempt to change his mind, and asks a
few basic questions about Tony's role at the council, and from those
questions Tony deduces that the HR guy thinks a programmer is something
to do with television.
Tony is working his notice, when a colleague brings an advertisement to
his attention.
The advertisement is for an analyst/programmer. It read, in part, "Must
have 10 years experience of AutoDebt."
There's only one person in the entire world who meets the requirements,
and he's going, not coming.
++++
PS: it didn't stop the council getting a great many applicants, all
claiming to have the relevant experience...