| status codes | The response codes sent by a server whenever a link is clicked, a webpage or file is requested, or a form is submitted. Common HTTP status codes important to SEO: |
| crawler | A program search engines use to crawl the web. Bots visit webpages to collect information and add or update a search engine’s index. |
| headline | An H1 tag. |
| deindexing | When a web page or pages are removed from a search engine directory. This can be temporary or permanent, and can happen for any number of reasons including a penalty from the search engine, a change in search engine crawl priorities, or a change in location of the page in question. |
| pagerank or page rank | Noun or Noun phrase. Named for Larry Page, primary author of the algorithm created to compute the value. 1) A recursive (q.v. recursion) link-based probability distribution used to assess the importance of Web documents by counting and valuing the links between documents according to the number and value of the links pointing to the documents. PageRank is based on citation analysis, a controversial but long-standing practice of assessing the quality and value of scientific papers based on the number of other scientific papers referring to them. 2) A derivative value computed from the first PageRank and defined across an integer scale ranging from 0 to 10; often identified as Toolbar PageRank or denoted as TBPR. |
