SEO plays a key role in improving the business of a commercial website. Two websites with the same product or service may have different positions in search results. Having a higher position in the search results can result in more visitors, which ultimately increases revenue. Search engine optimization is also beneficial to a website’s usability and user experience. The process of crawling web pages is crucial to search engine optimization. This is done by crawlers, also known as spiders, and a key element of effective SEO is having an accessible web page.