&usg= - what does this relate to?

query string attached to destination url

[golles]

when you look at the destination url of adwords ads (via view source in a serp listing)many (but not all) of the urls have the query string '&usg=' appended, e.g.:

&usg=AFQjCNHRaqqCpfsy9tzz_lJUqlqnc283cg

Can anyone let me know what this relates to?

I am guesing it is an adwords account setting of some description or even analytics related. It is just puzzling beacuse I see the majority of dest urls with it but some without.

Thanks

[nimeshatbms]

Are you using Google Analytics? Is your adwords account attached to analytics account?

If yes, then Google will add its own parameters in the destination URLs for tracking in Google analytics.

This option is present under the "My account" tab as "Tracking" and "Auto Tagging" will be enabled.

[golles]

i am not talking about my url's buth those of other advertisers in the search results.