N othing matters more to your Web site's success than a good search tool. You may feel your Web site's logical layout obviates any need for a search tool, but chances are a first-time visitor won't agree. Even if it's a paragon of elegance and efficiency, too many users have been traumatized by poorly organized Web sites to even try browsing anymore.
Users are task-focused and want to find specific information as fast as possible.
That means using a search tool. The logic behind a usable search tool is simple. People search because they have a question that needs an answer. The search tool's job is to learn the question and provide a clear, concise answer. The first thing you should do is put a simple search tool on every page of your Web site.