Keyword selection is very basic and the most important step in search engine optimization. The success of SEO campaign depends on keyword selection. While selecting keywords few points should be kept in mind such as they should be relevant to the site, they should describe the business suitably; they must be popular and attract considerable traffic. The keyword should possess less competition and must be less optimized.

Types of Keywords:

Keywords can be classified into 3 categories.

1. Single word keyword
   
2. Multi word keyword
   
3. Theme based keywords

1. Single word keyword: Single word keywords are considered to be the most generic keywords. Usually they are targeted on the home page to attract huge traffic. Though they attract more traffic the percentage of relevant traffic is very low. Therefore SEOs prefer to use 3-4 word keywords to attract more relevant traffic.
   
   
2. Multi word keywords: Two or more word keywords are called ‘Multi word Keywords’. Since multi word keyword contains a little described query, it attracts more targeted audience to the site. Also searchers always prefer to use 3-4 word keyword, it is more likely that your keyword matches the search query. Multi word keyword mostly contains qualifiers like place, color, location etc.
   
   
3. Theme based keywords: Theme based keywords attract highly targeted as well as good amount of traffic. Theme based keywords are considered as primary keywords which are related to the theme of site. They are present across the site. The traffic attracted by theme based keywords is more likely to be converted into sales.

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