Request received, continuing process. This class of status code indicates a provisional response.

200= OK, The request has succeeded. The information returned with the response is dependent on the method used in the request.
201 = Created.
202 = Accepted, The request has been accepted for processing, but the processing has not been completed.
203 = Non-Authoritative Information
204 No Content
205 = Reset Content
206 = Partial Content Notice that a file has been partially downloaded.

4xx - Client Error
The request contains bad syntax or cannot be fulfilled. The 4xx class of status code is intended for cases in which the client seems to have erred. These are typically the most common codes encountered while online.

400 - Bad Request - The request contains bad syntax or cannot be fulfilled.
401 - Unauthorized - Similar to 403 Forbidden, but specifically for use when authentication is possible but has failed or not yet been provided.
402 - Payment Required - This code was intended to be used as part of some form of digital cash or micropayment scheme To date this code has never been used.
403 - Forbidden - The request was a legal request, but the server is refusing to respond to it. Unlike a 401 Unauthorized response, authenticating will make no difference.
404 - Not Found - The requested resource could not be found. This is the typical response from a site that is no longer online as a valid web address.
405 - Method Not Allowed - A request was made of a resource using a request method not supported by that resource.
406 - Not Acceptable
407 - Proxy Authentication Required
408 - Request Timeout - Client failed to continue the request
409 - Conflict
410 - Gone Indicates that the resource requested is no longer available. This is the proper response but 404 errors are often used instead.
411 - Length Required
412 - Precondition Failed
413 - Request Entity Too Large
414 - Request-URI Too Long
415 - Unsupported Media Type
416 - Requested Range Not Satisfiable - The client has asked for a portion of the file which the server cannot supply.

This is alos known as split testing. Creating two (or more) versions of a webpage, website, product packaging, ad verbage.. etc which are used to test against one another. Let's say that you create a website with 2 pages selling the same product. By running analytics on each page you can determin which page (page A or page B) has the best response. This is a critical form of optimization.

Absolute Link A link which uses the full URL of the page being linked to. Some links use relative link paths instead of the entire URL within the a href tag.

Example of an absolute link: a href="http://domain.com/filename.html">Linked Text<

Example relative link: a href="/../folder/filename.html">Linked Text<

The main body of text displyaed below the title and above the url. In adwords this is the 2nd and 3rd lines each alotting 35 characters of space for the ad copy (including punctuation).

Affiliate marketing is the process of revenue sharing that allows merchants to duplicate sales efforts by enlisting others to market their programs or products. These affiliates attract additional buyers or prospects and earn the equivalent of a referral fee based on an action such as a purchase, filling out a form, or signing up new affiliates (viral marketing).

A set of simple instructions that combine to accomplish a task. Computer codes are algorithms. Search engines use algorithms to rank listings in response to a query (also called "search returns). Search engines guard their algorithms closely, as they are the unique formulas used to determine relevancy. Algorithms are sometimes referred to as the ”secret sauce.”