Universal content tagging is the process and ability to add tags to content that typically relates to a specific product or service, anywhere online. 

Content tagging, in this sense, originated in restricted forms across various social media. The digital marketing action or tagging process is now commonplace, widely accepted, and available via universal content tagging platforms. Companies like Instagram, Pinterest, and Shopify were early adopters of the product tagging process before becoming a generic process and universally applicable online through universal tagging platforms.