This document provides an introduction to web analytics. It defines web analytics as the measurement, collection, analysis and reporting of internet data to understand and optimize web usage. The main goals of web analytics are to measure traffic, understand user behavior on websites, and optimize websites. It discusses different categories of web analytics including on-site and off-site analytics. Common web analytics tools like Google Analytics use page tagging to collect data as users interact with websites. Key metrics that web analytics measures are discussed like visits, time on site, bounce rate, and conversion rate. The document also covers common web analytics products, how data is collected and stored, and factors to consider when selecting a web analytics tool.