They can add pixels or tags to get additional information to know how people are using their site.
What do you mean by Analytics of website?
Web analytics can be defined as the  collection, reporting, and analysis of website data. It uses customers' or visitors ' outlook and user website data to determine the success or failure.
Based on the data they can capture various data, facts and determine user experience. It helps in measuring traffic rate, bounce rate , Conversion rate optimization.
The three types of analytics are
To know more about Web analytics from the given link
https://brainly.com/question/22973032
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