Events are user interactions with content that can be measured independently from a web page or a screen load. Downloads, social share, click to call, mobile ad clicks, gadgets, Flash elements, AJAX embedded elements, video plays and othe UI elements are all examples of actions you might want to measure in your Analytics account as Events. An event hit includes a value for each component, and these values are displayed in your Analytics reports: Category, Action, Label (optional, but recommended) and Value (optional).