META tags used to define the primary search terms of a Web page.
Description
Keywords, also known as search terms, are the words or phrases that people enter into search engines to find websites about or related to that term. To attract more visitors to their page, one needs to optimize your website for these keywords. If a key search phrase is not in at least one of the pages, the search engine will not rank the page highly for that phrase; therefore missing out on all the potential traffic the search phrase generates.
The keywords tag belongs in the HEAD section of a Web page, typically placed below the META description tag. Do not use any keyword excessively, as search engines will perceive this as spamming. Also, keep the keywords and phrases relevant to the actual text of the page.
If we think about the keywords and key phrases they seem a small thing in SEO but infact this is the thing which could shape your business towards new dimensions, we can’t deny the importance of the keyword in SEO. Keywords and keyphrases are the words on your site that match these search terms.
Well it is very important to understand the target market and audience before doing anything for SEO, and what type of search queries and terms searchers use for it. Once we know the search terms being used, these can be included in the content of our Web site as keywords. Keywords and keyphrases will also be used if we plan to promote our website with pay per click or keyword based pay per impression advertising.
What happens when a searcher comes to a search engine, like he/she simply gives a key term in search engine, and search engine brings best suitable matches to that key terms, now if your keywords are best optimized in your page text then it increases the chances of coming our page in the top result pages, and we could have a more number of visitors and then finally a good ROI,