This document defines and provides examples of niche websites. A niche website focuses on a narrow subset of a larger market with a common specific interest. Examples given include sites focused on river fishing or kitchen ovens. Choosing a niche that is profitable, has low competition, and demand for related products is advised. Building a successful niche site requires producing high-quality, helpful content and using strategies like SEO, social media, email lists, and paid traffic to attract an audience. While work intensive, niche sites can provide a passive income opportunity if done successfully.