Even Kang Rohman got little puzzled to explain about the Niche, but seems the discussions about Niche are very important. So, it will not be a trouble if reckless in explanation I guess.
Niche is a focused and specific thing. Niche keyword are specific keyword, Niche blog is a blog that tells something specific rather than general. Niche market is a target market which is aimed specifically.
In order not to be confusing, I take Shoes as the example keyword. As seen as Niche’s point, shoes are not qualified yet because it is still common. And which considered as Niche? Which is more specific such Original Futsal Shoes, Adidas Futsal Shoes, etc.
A blog with a specific discussion has it own target visitors, and more often easier to get aimed visitors rather than general blogs. The most important thing that we must take a note is that we must selective in choosing a Niche, what niche are peoples most look for and less competitors in search engine. To know all of it, you should to do research using keyword research tool. Those tools are many in internet in paid or free.
The most used free tools for keyword research is Google AdWords Keyword Tool.
For other tools, you just search it on Google with some keywords like “Keyword Tool”, “Keyword Suggestion Tool”, etc..
article by kang rohman