For text, it's the keyboard.
For graphics, It can be a scanner.
Sometimes you could also use a wacom tablet for drawing, if that's what you mean by graphics.
And then there is the touch screen. (in certain computers)
Graphics can be input into computer by using an image scanner (or just called 'scanner'). It is a device that optically scans images or text and converts it to a digital form.
it's called a "scanner"
Text and graphics can be displayed on a computer's monitor (screen).
scanner
graphics mode , the system sets the mode to graphics from text mode
Text based communication.
none, it only did text
Neither. A computer contains both input and output devices. Many modern input and output devices contain embedded computers, that interface between the main computer and the actual input or output hardware of the device.
Input is any action you take to give the computer information. Typically this refers to a Keyboard and/or mouse, but can also be other devices ie. a scanner. Output is the result of input that you supply. This can be anything from printing a paper, displaying text on the monitor, rendering graphics and many more.
One example is the monitor (screen) of a computer that displays text and graphics.
The CPU (Central Processing Unit) is an input and output device. Think of it as the brain of your computer. You give it commands by typing on the keyboard, moving the mouse, etc (input) and the CPU processes this command and tells the computer to display text on the monitor or move the cursor to a new position (output)
A computer without a graphics card will have no video output. Therefore you'd only be able to play games which do not require any visuals. (I'm counting CPU's with graphics cores and built in chips as a graphics card.) a game of battleship that has no graphics and only text.... assuming you have a way to input digits and a readout or Pong if you just have a oscilloscope.
interactive
Hardware components that allow you to enter data :Keyboard : alphanumeric dataMouse : clicks and points, which do consist of dataMicrophone : voice/audio data, voice commandswebcamtouch screens : specialized inputtouch pads : laptops and special devices