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			5.1
+U
+en
+Presto/2.10.229+Version/11.60			2.10.229+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.