what are yellow pages on the internet

what are yellow pages on the internet. do the yellow pages contain any special type of information. what are the purposes of creating yellow pages. do they have information on businesses

i don't know exactly that what are yellow pages on the internet but i think that the yellow pages are something related the IT, but i am not sure about it, so you can check it out by searching it on the internet

i think that the yellow pages are the pages which are about the businesses and business man of thecountries in the whole world, but i am not 100% sure about this.

Dear mustang, yellow pages contents advertisement for buy and sell . You find this city wise advertisement on yellow pages, also you find all bustness listing there.