Networks come in all shapes and sizes and will vary upon the vertical, pricing model or niche they specialize in. For example, some networks will only specialize in one type of offer or one kind of niche, i.e fitness and health or dating. However, some networks will provide you with multiple offers across all the popular niches. While some networks will specialize in smaller promotions and merchants, whereas others will work directly with large and well known brands. Networks can also specialize in specific pricing models. Affiliate networks are closed to the public and always require an application. It’s free to apply to a network. But, you’re not always guaranteed approval. The reason networks vet their applicants is due to the growing amount of fraud in the industry and also they may only want a certain type of affiliate.