An often used technique for affiliate marketers is Internet-based niche segments of larger markets, referred to as niches, a website can be developed and promoted quickly to uniquely serve a targeted and usually loyal customer base, giving the affiliate a small but regular income stream. This technique is then repeated across several other niche websites until a desired income level is achieved. A bigger niche is harder to market to as the expense of online advertisements increases according to the popularity of the keywords used (on Adwords, for example).
Some niches may become saturated with marketers, increasing competition and thus, according to the economic law of supply and demand, reducing the slice of the pie available to each competitor. One solution is to find smaller, “undiscovered,” but still profitable, niches, usually by searching out the best keywords to target. These lower cost keywords are called long-tailed keywords, as in the long tail of secondary keyword phrases that usually follow the main keyword in popularity of number of searches conducted by Internet users. Some are too obscure and may have very few or even no clicks per month, and therefore not much use to target.