Web analytics is the measurement, collection, analysis and reporting of internet data for purposes of understanding and optimizing web usage.
There are two categories of web analytics; off-site and on-site web analytics.
Off-site web analytics refers to web measurement and analysis irrespective of whether you own or maintain a website.
On-site web analytics measure a visitor’s journey once on your website. This includes its drivers and conversions; for example, which landing pages encourage people to make a purchase. On-site web analytics measures the performance of your website in a commercial context. This data is typically compared against key performance indicators for performance, and used to improve a web site or marketing campaign’s audience response.