Total Visitors:
shows you how many visitors you have had to your site.

Other options include even more reports:

Search Engine:
which search engines are driving you the most traffic?
Keywords:
which keywords are your customers using to find you in search engines?
Referers:
where did visitors find your site?
Page view:
counts broken down by day, week, month, year.
Visitors:
counts broken down by day, week, month, year.
Browser report:
which browsers are your visitors using?