Long-tail keywords are extremely useful for SEO. Basically long-tail keywords are opposite to head (or popular) keywords that more frequently searched by users. For example, “real estate” is a head term, but “affordable real estate in Brooklyn” is a long-tail keyword.
Long-tail keywords are especially effective in large ecommerce sites, where thousands of pages are indexed by Google and other search engines.
If you optimize your website pages for long-tail keywords, you should very quickly begin to see results from it in sales and traffic because this strategy is good for selling products. The important thing about long-tail that many niche products have a potential to generate a huge volume of sales. The long-tail keywords help to realize this potential for website owner.
Just take a look at Amazon or eBay. According to Chris Anderson’s research, Amazon.com makes 57% of sales from keywords outside of “head” terms. Search for some niche products and you will figure out that long tail keywords are really helpful for selling.