Yellow page is a business phone book which contains businesses categorized and listed in them. Yellow pages were used to print the book and hence the name came in to being. Due to the high cost of yellow pages, white pages were used instead. But still the name remained as such and is being used for online directories as well. The annually published books were distributed in the local areas. The telephone directory of the subscribers published in a geographical area is known as white page. In white page, alphabetical listing of names and the telephone numbers are given. White pages are found online and some sites offer even reverse look up facility.