A crawler is a program used by search engines that traverses the internet in order to gather and index data.
A crawler will go to a website through a hyperlink. The crawler will then read the website’s content and embedded links before following the links away from the website. The crawler will continue this until it has visited and indexed data from every single site that has a link to another website. It basically crawls the internet, hence the name.
A 301 redirect is an instruction that tells a browser: “The requested page is no longer available at the URL you have, you’ll find it at this new new address”.Learn More
Every website has a Domain Rank. This represents the total amount of positive link metrics associated with a website in total. The Domain Rank is controlled by the combined PageRank of all of the individual pages on a website.Learn More