T
Typically into a little tray fitted with a sponge.
Eventually it fills up. What happens next depends on the printer.
Options include...
a) A nice warning message.
b) A nice warning message and it stops working.
c) leaks ink all over the place.
Typically most of the ink turns into a paste and only the new ink
leaks. My HP895cxi lasted about 6 years before it filled up and
started leaking. I was lucky and was able to take the printer apart
and scoop out the solidified ink with a plastic spoon. Really messy
job but it should be ok for another 4-5 years.