SEO tools help to find many important characteristics of a website. The age is one of the major factors used to rank a web site. In a small way, the age of a domain gives the appearance of longevity and therefore a higher relevancy score in major search engines.
The WebRank is a measurement of how important a search engine thinks your site is. Over the past few years, the importance of a website's web rank has increased. The structure of your internal links is helpful in providing certain optimized pages. By using different linking structures, the web rank can be shifted to sites that are more important. In most cases, a web site wants its homepage to have the highest WebRank allowing it to appear in the search engine results. To achieve this, the homepage should be the center of your website's linking network. The name and quality of inbound and outbound links can determine your site's reputation and can provide a substantial boost in search engine ranking.
An indexed page is a page that has been crawled or searched by a search engine. Search engine spiders travel around the internet by following hyperlinks and build a searchable index of content as they go. The more indexed pages you have, the greater the likelihood of being indexed and appearing in search results.
The left sided tools help you get all kinds of statistics of your competitor's domains. The statistics include Yahoo WebRank, Pages Indexed by various Search Engines, Backlink count, Alexa Taffic Rank, and Age of the domains.