What is a Touch screen?
Touch screen is an input and output device and also a display screen.
On the screen text or pictures are displayed.
A user interacts by touching the screen.
When a touchscreen is used there may be no requirement of keyboard or screen.
These are widely used in smart phones, ATM machines and other equipments.
What is a Digital Video?
Digital Video stores images from video camera or television in a digital format. Digital videos are preferred over analog videos. And used in multimedia presentations.
What is a Scanner?
An image scanner is an electronic device.
It optically scans images, object, text, pictures or handwriting and converts it to a digital image.
It is similar to photocopier machine but makes digital copy of an image.
What is a Graphic tablet?
A graphic tablet is a computer input device
A user can write text, draw pictures, images, animations and graphics, with a special pen like input device.