The Internet is a worldwide system that connects smaller computer networks together using standard protocols. When connecting to the Internet, users enlist the help of their computer, an Internet Service Provider (ISP), a server, and a telecommunications network. Most information is shared freely, while ISPs charge access fees. Both phone and cable companies provide high-speed Internet access. The Internet provides services like email, bulletin boards, information searching, real-time communication, and unique addresses for each user. It has become an important market and revolutionized shopping and social interaction through websites like Facebook.