Definition of Virtual Reality
Virtual Reality (VR) or Virtual Reality is a technology that allows users to interact with a 3-dimensional environment simulated by computer to a real object or imagination, thus making the user as if physically involved in the environment.

Implementation and Examples of Virtual Reality
This technology is typically used in the medical field, architecture, and the flight has a huge risk and in need of a prototype that mimics real conditions before being implemented.
For example: a prospective pilot can use VR for flight simulation uses a special computer to perform the test.

Virtual Reality Devices
Virtual Reality typically requires special equipment.
Such As:
  1. computer screen to display the environment,
  2. loudspeakers to receive auditory information,
  3. tracers to monitor the movement of the user's head,
  4. gloves for hand motion capture and transmit information to the movement of the system,
  5. walker to monitor the movement of the feet, etc.

How it Works Virtual Reality
In principle, the user see the actual virtual world is dynamic images from computer simulation results. Through special devices VR, a user can interact with the world and get feedback apparent that seems real, both physically and psychologically.

Definition Augmented Reality
Augmented Reality (AR) is a technology that combines the virtual objects (both two-dimensional and / or 3-dimensional) and real objects into a real 3-dimensional environment, and then projecting the virtual objects in real time so that the integrated and running interactively in the real world.

Implementation and Examples of Augmented Reality
This technology is typically used in military, medical, communications, and manufacturing that has a big risk and in need of additional objects that mimic the pseudo real objects before being implemented.
For example: the examination before surgery such as a CT scan or MRI which gives an overview to the surgeon regarding a patient's internal anatomy.
From these images, then surgery is planned. AR can be applied so that the surgical team can view data from CT scans or MRI at the time of surgery patients.

Augmented Reality Devices
In general, Augmented Reality requires (a)input devices such as a camera or a webcam, (b)output devices such as a monitor or a Head Mounted Display (HMD), (c)a tracking device so that additional virtual objects generated in the form of markers run in real-time or interactive as possible despite the real object that becomes the parent digeser- shear, and (4)a computer to run the AR program.

How it Works Augmented Reality
Augmented Reality works based on the detection of the image, and the image that is used is the marker. Its working principle is calibrated camera will detect a given marker, then after marker recognizing and marking patterns, the webcam will calculate whether the marker according to the database owned. If not, then the marker information will not be processed, but where appropriate, the marker information will be used to render and display 3D objects or animations that have been made previously.

Differences in Virtual Reality and Augmented Reality
Virtual Reality replace reality with all the world as a whole, while Augmented Reality add or supplement reality with pseudo-objects.