This document defines and discusses niche websites. It explains that a niche website focuses on a narrow subset of people within a larger market who share a specific interest. Choosing a very targeted niche keyword is important to have low competition. Specific niche topics are closer to the end of the purchase funnel, improving chances of sales or commissions. Examples of successful niche sites include those about training programs, product categories, and health/fitness topics. The document provides advice on niche site ideas and how to further niche down a broad topic into a more targeted focus.