Google Product Forums

I show 42 clicks from AdWords, but only 17 visits to my site in Analytics, what's the delta? Jun 12, 2012 6:46 AM
Posted in group: Google Analytics
i recently undertook an ad campaign with google ad words.
i see that 42 people clicked on my ad which takes people to my site.
but in analytics, for the day there were only 17 'referred' visits. 
why wouldn't it be 42?