1. Universal Serial Bus (USB) is a specification to establish communication between devices and a host controller (usually personal computers), developed and invented by AjayBhatt while working for Intel .USB has effectively replaced a variety of interfaces such as serial and parallel ports
2. In computing, a Mouse is a pointing device that functions by detecting two- dimentional motion relative to its supporting surface. Physically, a mouse consists of an object held under one of the user's hands, with one or more buttons.
3 . A keyboard is typewriter which uses an arrangement of buttons or keys to act as mechanical levers or electronic switches. After punch cards and paper tape, interaction via teletype-style keyboards became the main input device for computers.
4. A device containing a transducer for converting sound waves into electrical signals that can then be amplified, transmitted, and output through a speaker.
5. A Webcam is a video camera which feeds its images in real time to a computer or computer network, often via USB, Enthernet or Wi-Fi.Their most popular use is the establishment of video links, permitting computers to act as videophones or video conference stations This common use as a camera for the web gives the webcam its name.
