The act of supplying a URL to a search engine in an attempt to make a search engine aware of a site or page. At a minimum, submitting to a search engine involves adding the URL of the site or page that will be under consideration. Search engines sometimes ask for additional contact information, including name and/or email address. Policies for adding URLs vary among various search engines. Some search engines only ask for the main URL of a site, claiming that the rest of the site will be spidered; others require the submission of individual pages. Variation also exists with regard to how often URLs may be added, as some engines have tried to discourage bulk submissions in an attempt to minimize spamming. Confusing search engine submission with search engine optimization is a common mistake. The mere act of submitting does nothing to optimize the pages in question and achieve higher rankings. In fact, submitting poorly-optimized pages can do more harm than good.