Adwords: It’s a common method of website advertisements as Google Pay Per Click, which is a contextual advertisement program.

 AdSense: Google AdSense is a fast and easy way of earning money by displaying Google ads on the website’s content pages by publishers of all sizes.

 Alt Attribute: The Alt attribute is used to substitute the text description with the respective image. It provides the text equivalent for the image.

 Anchor text: It is used to denote a hyperlink that connects the webpages. The search engines use it to indicate the relevancy of the referring site and the content of the landing page.

 Black Hat SEO: The methods used for Search Engine Optimization, which attempts to improve rankings in ways that are disapproved of by the search engines, or involve deception.

 CPC: It stands for Cost Per Click. It’s the rate that is paid per click by a Pay Per Click Advertiser.

 CPM: It stands for Cost Per Thousand impressions. A statistical metric used to measure the average value / cost of Pay Per Click advertisements is called CPM.

 Crawler: It’s a program which moves through the worldwide web by navigating the link structures to gather relevant data. It’s also called bot or spider.

 Doorway Page: A web page designed deliberately to attract traffic from a search engine.

 Cache: It’s the replication of a web page stacked by a search engine.

 Del.icio.us: It’s a popular social bookmarking website.

 Directory: It’s a website committed to directory pages. For Example: the Yahoo directory.

 Digg: It’s a social news website where users vote on different stories.

 DNS: Domain Name Server or Domain Name System: It’s a naming mechanism that is used to resolve a domain name/host name to a specific TCP/IP Address.

 Forums: It’s a virtual community i.e. also known as discussion forums.

 Google: Google is world's leading search engine in terms of reach across World Wide Web.

 Google bomb: It’s the combined effort of multiple webmasters, to alter the Google search results usually for humorous effect.

 Google Dance: It’s the change in SERPs(Search Engine Result Pages) stimulated by an update of the Google database.

 Googlebot: Google’s spider program is called Googlebot

 Inbound Link: It’s the link that points to one website from another website.

 Internal Link: It’s the link that directs the browser from one page on a website to another page on the same site.

 Keyword: It’s the word or phrase that a user enters into a search engine to get the result.

 Keyword Density: It’s the percentage of a particular keyword on a single web page. Unnaturally high value of the keyword density on a page may be penalized.

 Landing Page: It’s the page on which user lands after clicking any link in SER (Search Engine Result).

 Link Bait: It’s a webpage designed with the purpose of attracting incoming links, mostly through social media.

 Link Building: It’s the technique of actively generating incoming links to a website.

 Link Exchange: It’s a reverse or reciprocal linking scheme and it helps to increase the value of site.

 META Tags: Meta tags means the statements within the HEAD section of an HTML page providing detail information about the page.

 Nofollow: This command is basically found in either the HEAD section of a web site or within individual link code, that instructs robots so as to which links are not to be followed.

 Noindex: This command is basically found in either the HEAD section of a web page or within individual link code to instruct robots not to index particular page or link.

 Pagerank: It’s a value between 0 and 10 assigned by the Google algorithm to a webpage, which measures the link popularity with other important factors.

 PPC: PPC means Pay Per Click. It’s an advertisement scheme where advertisers pay to ad agencies like Google whenever a user clicks on their ads.

 Reciprocal Link: It’s also called link exchange, link partner. It indicates two websites linking with each other.

 Robots.txt: It’s a file found in the root directory of a website i.e. used to control and restricts search engine spiders behavior.

 ROI: Return On Investment means a measurement of how much return you get from a single marketing dollar.

  SEM: It stands for Search Engine Marketing. SEM is associated with researching, submitting and positioning a website within a search engine to get higher ranking.

 SEO: It stands for Search Engine Optimization. SEO is the process used to increase the number of visitors of a website by achieving higher rank in SERP.

 Sitemap: Sitemap is a page or structured group of pages which links to every page on a website.

 Social Media: It comprises of various online techniques like blogs, forums, bookmarking used by people to share information and ideas.

 Social Media Marketing: It’s method of promoting website through social media.