Modem: Modem is a device that connects one computer to another using a telephone line so that data can be sent.
Router: Routers enable several computers to communicate through a wireless access point at the same time.
Gateway: Gateway is a router that connect two computer networks with different protocols.
Web Browser: A web browser is software that lets you access the information available on the Web. Popular browsers include Microsoft Internet Explorer and Mozilla Firefox. All web browsers operate in a very similar manner and have similar features.
Email client: An email client is used to send email.
Type of Connection:
Broadband: Broadband is usually available over telephone land lines or cable. This refers to data transmission using ADSL and cable. ADSL is a means of transmitting digital signals using telephone lines. Coaxial cables, fibre optic cables, microwave links and communication satellites are commonly used to provide broadband. Microwave signals are very high-frequency radio signals that can be transmitted through space. A communications satellite accepts signals beamed to it from a point on Earth and then reflects the signals to another point. Communication satellites can transmit data that includes text, voice, pictures and video.
Dial-up: Dial up is when your computer dials up a phone number to connect you to your ISP using telephone line. This is a legacy method used by individual home users to access the Internet. Dial up connections are very slow but inexpensive if you do not access the Internet very often.
Wi-Fi: A Wi-Fi sends data wirelessly i.e. using radio waves instead of cables.
VPN: A VPN is private network that runs within public networks. Conceptually it is similar to an extranet but network traffic will be encrypted and Internet protocols such as TCP/IP might not be used. It can be thought of as a separate ‘pipe’ inside the Internet. Network traffic inside the pipe is inaccessible to those outside the pipe.