Websites are created to achieve specific goals. To know if your website's perfomance is satisfactory you need information about who is visiting it. Statistics about your website are known as website analytics.
Collecting Information Responsibly
Software used for website analytics
There are various software products that can be used to provide web analytics. Google Analytics is one of the most common choices, but there are also alternatives. The software used depends on what you require from your website and the amount and type of information you need to collect.