Not all search engines are equally efficient for the user. The suitability of a search engine differs for private and professional purposes.

General search engines are aimed at all Internet users. However, when used for business purposes their limits are quickly reached: it is often the case that from thousands of so-called "hits" not a single one provides informative contact data.

This is where specialized b-to-b search engines like "Wer liefert was?" can help. In contrast to general search engines they access preselected sources and data and the buyer scores a direct hit at first go.