The internet takes this even further with the use of "search engines". This is a powerful tool which allows people to quickly locate pretty much anything they want. Suppliers with an online presence make their details known to these search engines so that when a match is made they appear in the results list. This also allows users to browse categories, because quite often they might not know exactly what they want. An example is someone buying a television. Some may know the exact model, some may not and just want to see whats availiable before deciding. A supplier marked as a supplier of televisions would be useful in this case.