How Search Engines Work:
Search engines have basically three parts, the spiders or robots, the indexes and the software algorithm. When a search query is performed on a search engine, the spiders crawl the billions of web pages that exist on the Internet looking for relevant information as well as the search engine
index. When a spider crawls a web site it adds the keywords and other relevant information based on the algorithm, it found on the web site to the index.
The algorithm is a very sophisticated software program that is proprietary to each search engine. The algorithms determine the ranking of the web site pages base on many attributes and feature of the site. While all algorithms are proprietary to each search engine, there are many common attributes of a web site or web page, that they are looking for in order to determine the indexing or ranking of a website. These attributes are referred to as on-page and off-page such as links, submissions, site popularity etc. The algorithm uses a sophisticated system of weighing the relevance of the attributes of the sites and pages and places them in the index accordingly.
Pay-Per-Click Advertising:
Pay-Per-Click Advertising is an advertising revenue system employed by search engines, as well as contextual and social ad networks. Advertisers pay for or bid on keywords and agree to pay a certain amount for each click on their ads.
Banner Ads:
Banner ads are a very popular form of online advertising. The banner ads direct users to the advertisers web site when clicked on. While they vary in size, they are generally rectangular in shape and measure 468 pixels wide by 60pixels high.
Key Terms & Definitions:
Algorithm:
A software program developed by search engines, used to rank the web sites.
Alt Tag:
The Alt Tag is an attribute of HTML and specifies property for an HTML element.
Backlinks:
These are links from other websites to your website. These are important as they help improve your web sites organic ranking.
Click Through Rate (CTR):
CTR is the ratio of users who click on an advertisement out of the total number of users who view but do not click on the ad.
Conversion Rate: