An SEO technique is considered white hat if it conforms to the search engines' guidelines and involves no deception. As the search engine guidelines are not written as a series of rules or commandments, this is an important distinction to note. White hat SEO is not just about following guidelines, but is about ensuring that the content a search engine indexes and subsequently ranks is the same content a user will see. White hat advice is generally summed up as creating content for users, not for search engines, and then making that content easily accessible to the online "spider" algorithms, rather than attempting to trick the algorithm from its intended purpose. White hat SEO is in many ways similar to web development that promotes accessibility, although the two are not identical.
Clients turn to search engines because they really need a product or service. They have already created a need; it only remains to find a company that suits their interests. It is a medium that can easily encourage conversion, if the company offers what the customer is looking for; the visit will result in action by the customer, either a direct purchase, request for a quote, or more information for a later purchase.