Referring to Wikipedia Google Glass is a wearable computer with a head-mounted display (HMD) that is being developed by Google in the Project Glass research and development project with the mission of producing a mass-market ubiquitous computer.
You can simply say that Google Glass is a camera, display, touchpad, battery and microphone built into spectacle frames so that you can perch a display in your field of vision, film, take pictures, search and translate on the go. It displays information in a smartphone-like hands-free format that can interact with the Internet via natural language voice commands
What can Google Glass do?
For the developer Explorer units:
• Android 4.0.4 and higher
• 5-megapixel camera, capable of 720p video recording
• Wi-Fi 802.11b/g
• 16GB storage (12 GB available)
• Texas Instruments OMAP 4430 SoC 1.2Ghz Dual(ARMv7)
• 682MB RAM “proc”.
• 3 axis gyroscope
• 3 axis accelerometer
• 3 axis Magnetometer (compass)
• Ambient Light sensing and Proximity sensor
You can experience the real Google Glass here
How to get Google Glass, Click Here