answer

1.-> Input Device is any hardware component that allows users to enter data and instructions(program, command, and user response)
 Input is any data or instruction entered into the memory of a computer.
*Program is a series of related instructions that tells a computer what tasks to perform and how to perform   them.
*Command is an instructions that causes a program to perform a specific action.
*User Response replying to a question displayed by a program to perform certain actions.

2.Keyboard is an input that contains keys users press to enter data and instructions into a computer.Most keyboard also have function keys programmed to issues commands ; toggle keys that switch between two states when press; and keys used to move the insertion point, or cursor , on the screen.
3.Mouse is a pointing device that fits under the palm of your hand.
Optical mouse -> emit and sense light to detect the mouse’s movement.
Laser mouse -> uses a laser and is more expensive than an optical mouse.
Air mouse -> allows you to control objects, media players, and slide shows by moving
the mouse in predetermined directions through the air.
Wireless/Cordless mouse -> transmit data using wireless technology.

4.Touch screen is a touch-sensitive display device.Touch screen that recognize multiple points of contact at the same time are known as multi-touch.
*(Kiosk is a freestanding computer that usually includes a touch screen)
*(Microsoft Surface is a 30-inch tabletop display that allows one or more people to
interact with screen)
Touch-sensitive pad is an input device thatenable users to scroll through.