Google Analytics is a free web analytics service provided by Google that provides statistics and tools for search engine optimization and marketing. It allows users to see traffic to their websites, receive a tracking code, and view data like sessions, bounce rates, and conversions. Google Analytics provides reports on audiences, intelligent events, and real-time traffic. It is important for websites as it allows owners to understand where visitors come from, how they found the site, what browsers they use, and keywords to help improve the site and increase traffic. Some privacy concerns have been raised around the data Google Analytics can potentially collect.