Terminology:
1. Hits - this simply refers to the number of 'elements' loaded on a site. If one page has five images in it, viewing that page once adds 6 hits (one page + five images).
2. Impressions - the number of times all the pages on your site are seen. Impressions are sometimes referred to as 'hits' which can cause confusion.
3. Uniques - the actual number of people that visited your site.
To view the statistics of your account login to cPanel and click Webalizer or Awstats, these tools will have more information than you will probably ever need.