This metric is distinct from total page views, which measures the aggregate total of hits a website receives over a certain period of time. Paying attention to unique visitors is important for understanding the actual total number of potential customers your website is attracting.
Website analytics platforms (such as Google Analytics) can be used to easily track the total number of unique visitors that arrive on your site. In Google Analytics, you will see this metric reported as Users (this is a simple difference in terminology; in practice, users are the same as unique visitors in this case).
Where to Find Unique Visitors in Google Analytics