Search engines also provide lead generation options. Any business with a website can appear on a search engine listing for related searches, and visitors can then click a link and be taken to that company's website. However, some search engines also offer a pay-per-click lead generation option. The search engine posts a link to the company's website at the top of the search results form, making it much more likely that prospective customers will choose to visit that website. However, when a visitor does click the link the search engine charges that company a small fee, as opposed to the free 'general' listings. Companies that use pay-per-click advertising are advised to move cautiously at first, as an overly successful campaign can end up costing far more than expected!