A place in the olden days where people would go to find information on various things. Nowadays, you can just find this same information on the internet from your own home without needing to go to the library.
In current times, since not many people go to the library, they have added computers with internet access, which is mostly used by bums or other homeless people looking for porn.
"what stinks at this library? oh, nevermind, i see a bum over there looking at porn, it looks like he hasn't showered in a month"