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1. Mod_Rewrite
   Mod_Rewrite is a plugin on Apache server that helps in rewriting the requested URL. It also supports several rules and is friendly for both search engine and user URLs striving to increase indexing chances. This module seemed to be more helpful for major database-driven sites.
    
2. Meta Tags
   Meta Tags are Meta information that is not displayed in the web page but it is placed in HTML. Some important Meta tags are Meta keywords, Meta descriptions and Meta title.
    
3. Page Rank
   It is a method to rank the WebPages on the Google search result. It is scaled between 0 and 10. It is a major form of link popularity.
    
4. Search Engine Marketing
   Marketing campaigns or tactics undertaken to generate greater and quality leads by the search engines is referred as Search Engine Marketing.
    
5. Search Engine Optimization
   Search Engine Optimization is the technique involved in upgrading the page rank of a particular web page or website. It involves three steps such as technical optimization, content optimization and above all link building.
    
6. Spider
   Spiders are programs designed by search engine to explore periodically and automatically the website to download information to be stored in its index. It is also referred as bot, crawler or robot.
   
   
7. Anchor text
   Anchor text is the words that are used to give a description of the link. These words have a hyperlink which means that you can click on these words to view the content of the site. It gives information to the search engines regarding your site and it can boost your rank.
    
8. Contextual ad
   These are advertisements related to the content on the web page that the user is viewing. For example if the user is viewing a travel guide then ads related to travel like hotels and air fares are displayed on the same page.
    
9. CPM
   CPM is known as cost per thousand and this is an efficient method of advertising. In this you do not pay per click. Here you buy a set of impressions and each impression is a single occurrence when an ad appears on a website.
    
10. Doorway page
    A doorway page is a special page that has been created for users only to access the main website from the search engines.
     
11. Googlebot
    Googlebot is used by Google to search and gather documents on the internet to make an index for the Google search engine.
     
12. Google Adwords
    Google adwords is a system of advertising on Google. The service provided helps you to create ads, select the correct keywords to correlate with the ads and you pay only when visitors click on your ad.
     
13. Google Dance
    Whenever Google updates its index the term Google dance is used. Google used to update once a month and during this process backward links for pages were visible and there was fluctuation in the search results.

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