Advertisement   What it is: Web Analytics is used to measure important details, such as, how many people have visited a website, how many visitors were unique, how they came to the site (whether they came to it directly, or followed a link/ad), which keywords show strong rankings on search engines, how long they stayed on a certain page, and also, what they did while on the site (what links they clicked, when they came to the site, when they left, etc.). 3 Key Metrics You Need To Track: Traffic: