User Agent String:

Explanation of what each part of the User Agent string represents.
Part	Type	Description	Version
Opera/9.80	Web Browser	Opera, possibly incorect version	9.80
Windows NT 5.1	Operating System	Windows XP	5.1
U	Encryption	Supports 128-bit or better encryption
en	Language	English
Presto/2.10.229	Rendering Engine	Presto	2.10.229
Version/11.60	Web Browser	Accurate Browser Version	11.60

A User Agent is a short string that web browsers and other applications send to identify themselves to web servers.

Unfortunately, most browsers falsify part of their User-Agent header in an attempt to be compatible with more web servers.

Click on your user-agent string (in the green box) to get a link that you can share with other people.
Visit whatsmyua.com/ua/[any-user-agent-string], the site will give you a breakdown for that string.