An ISP, or Internet Service Provider, is a company that offers individuals and businesses access to the Internet. ISPs provide various services, including broadband, fiber-optic, and dial-up connections, allowing users to browse websites, stream videos, and communicate online. ISPs can be local, regional, or national, and they often offer different plans based on speed and data limits. Some well-known ISPs include Comcast, AT&T, and Verizon. In addition to internet access, many ISPs also provide services like email hosting and web hosting.