A core market refers to a broad target audience that a business or product is designed for. It includes a larger group of potential customers who have a general interest or need for the product or service. On the other hand, a niche market is a smaller, specialized segment within the broader market. It focuses on a specific subset of customers with unique needs or preferences that may not be adequately addressed by mass-market offerings. Niche markets often have less competition and allow businesses to tailor their products or services to meet the specific demands of that particular segment.