14 spots left to join us for the Digiday Publishing Summit

Join us Sept. 14-16 in Miami to connect with top publishing leaders

SECURE YOUR SEAT

WTF is piggybacking?

This article is a WTF explainer, in which we break down media and marketing’s most confusing terms. More from the series →

Piggyback rides can be fun for children. For website operators, not so much. 

Piggybacking — also known as cookie-syncing — is how an ad tech firm can drop a third-party cookie on a website’s visitors without being granted access by the website via another ad tech firm that the website has granted access, as covered in the explainer skit above. 

An issue with this third-party tracking daisy-chain is that it makes it difficult for website operators to rein in outside companies’ abilities to collect information about their audiences, which risks putting the operators in privacy regulators’ crosshairs.

More in Marketing

Illustration of a performer balancing money weights on a tightrope, symbolizing how brand safety tools help marketers maintain performance and control.

Future of Marketing Briefing: The public ad tech era is over

Gone are the days when investors got themselves in a tizzy over ad networks, demand-side platforms and supply-side platforms on their own merits.

By the numbers: Wall Street’s tough assessment of ad tech

Big Tech continues to dominate digital growth, triggering a Wall Street exodus, but are returns imminent?

CMOs are struggling to link AI visibility with sales

Brands are spending on tools that rate their visibility within LLM responses and AI search, but proving the commercial impact of GEO remedies isn’t easy.