Adobe SiteCatalyst is a software-as-a-service solution that collects web analytics data like page views and visits from website visitors. It processes and reports this data. SiteCatalyst collects data through JavaScript tagging, which embeds SiteCatalyst code onto web pages to send visitor data to Adobe's data collection layer. SiteCatalyst provides both traffic and conversion variables to track visitor behavior. Traffic variables count events like page views, while conversion variables track persistent information like login status. SiteCatalyst also supports custom events to track specific user actions. Tagging is the process of adding the SiteCatalyst JavaScript code to web pages so analytic data is collected as pages load.