In affiliate marketing, a niche refers to a specific topic or area of interest that a marketer focuses on to promote products or services. A niche can be a broad category, a sub-niche, or a micro-niche. For example, the broad healthcare niche includes fitness, weight loss, haircare, skincare, etc. While a micro-niche could be skin home remedies for women under 40. Choosing a niche is important because it helps to define the target audience, which can be based on budget, demographics, geographics, and customer interests and preferences. By focusing on a specific niche, marketers can establish themselves as an authority in their industry, boost credibility, and develop the right strategies and solutions to promote the product effectively.

There are many niches available for affiliate marketing, and some of the most profitable ones include technology, travel, health, finance, fashion, lifestyle, pet care, gaming, survival, and security. When choosing a niche, it is important to consider the level of competition, search volume, and profitability. It is also recommended to find a different angle on how to promote products and to target a more segmented audience to convert them to potential customers.