Google Analytics is a free web analytics service offered by Google that tracks and reports website traffic and user behavior. It is used to collect data on visitor interactions on a website, in this case, your Dtravel Direct powered booking site. This includes metrics like page views, sessions, bounce rates, etc. It works by installing a tracking code on the pages you want to analyze, which enables Google to gather analytics data from visits to those pages. Data collected by Google Analytics can provide insights into how users find and interact with your booking site. For example, it shows referral sources, most visited pages, conversion rates, etc.