Keywords
What are keywords?

Keywords

Keywords are single words which helps to identify the content of a website or page within a particular website. Keywords are not only used in visible text of a website but also in the the title, description, keyword tag as well as other tags* in the html of the web page.

Some of these words are more valuable than others (from the point of view of the SEO) because people do their search using some particular keywords more than others. The popularity of keywords change as time passes making it necessary for the search engine optimization professional to make the necessary changes for the ranking and competition level of the keyword/keyword phrase in order to get as many qualified visitors* as possible. There are different ways of finding out which keywords are the most popular for a particular subject.
 

These websites can help you to find the right keyword/key phrases for your site:
 

Word Tracker

http://www.wordtracker.com/

Word tracker compiles a database of terms that people search for. Enter some keywords, and they will tell you how often people search for them, and also tell you how many competing sites use those keywords. Wordtracker helps to find all keyword combinations that bear any relation to any business, service or product - many of which you might never have considered.
 

Google AdWords

https://adwords.google.com/select/main?cmd=KeywordSandbox

This tool can provide ideas for new keywords that can help you improve your rankings. Although the AdWords research toll helps to find all keyword combinations that bear any relation to any business, service or product it does not provide the number of times a term have been searched. It was primarily created to help people find the best terms in their AdWords campaign.
 

Good Keywords

http://www.goodkeywords.com/

Good Keywords is a free Windows software for finding the perfect set of keywords for web pages. Knowing the right keywords to target is very important because your site should provide what people are searching for.

(*) other tags - Caution must be used when using keywords in other tags of the html since they could be considered spam by some search engines.

(*) qualified visitors - potential customers that come to your website. In one way or another these visitors are interested in what you are offering. Using tactics to attract visitors that are not interested in your products or services can  irritate the visitor, waste server resources and can hurt your rankings.