Lost click thrus

Why is number of site visitors less than google CTs?

[loial]

I use Adwords to drive people to my site, but notice that the number of "visits" for a day as logged by the hosting company that host my site, is always 10-20% less than the number of Click Thrus logged by google for the same day.
What is the likely explaination for these "lost" click thrus?

[aravindgp]

Some of them might be just clicking and then changing their mind before the site is opened.Or if the site load time is high then people may be not opening which may not be recorded at your site end as a click.

Hope this helps,
Aravind

[adamas]

Some people may be accessing your site from an ISP which caches the page in a proxy server. Subsequent visitors using the same ISP may have the page served from the proxy server without generating a request to your server.