Explained simply: it's a pair of glasses that's a computer. It sees what you see. Want to preserve what you're looking at? Just say, "Take a picture" or "Take a video" and it will.
Share what you see in real-time.
Want information about something you're looking at? It will absorb what you're seeing and Google it automatically. You'll get details in a fraction of a second.
Need directions? Say your destination and it will put a map right in front of your face.
Check it out.
This will be no big deal in a few years but still, it's a wonderful time to be alive!