An internet service provider (ISP) is a company that offers access to the internet for homes and businesses. They connect users to the web through various technologies, such as fiber optics, cable, or DSL. ISPs can also provide additional services like email accounts, web hosting, and security features. Choosing the right ISP is important because it affects your internet speed and reliability. Some popular ISPs include Comcast, AT&T, and Verizon. When selecting an ISP, consider factors like pricing, customer service, and available plans to find the best fit for your needs.