HTML (Hypertext Markup Language) is a standard markup language used to create and structure content for the World Wide Web.
Click-through rate (CTR) is a metric that measures the number of clicks an ad or a link receives relative to the number of impressions, or views, it generates.
A Universal Product Code (UPC) is a graphic and numerical code printed on retail packages and is often referred to as a barcode.
Return on ad spend (ROAS) is a marketing metric that measures the revenue generated from advertising campaigns relative to the amount spent on those campaigns.