Blog
CTV vs. linear TV: The decision framework for today's media planner
Learn more
Cookies identify online users and have become a mainstay of digital advertising. As web servers have no memory of their own, cookies are used to make websites remember a user’s action, so they aren’t asked to perform a task again and again. As a result, they help provide a better, more personalized user experience.
And while most marketers know this broad definition, getting into the weeds regarding the different types of cookies and how they differ from one another can be trickier. However, with the current trend of third-party cookie deprecation, it’s more important than ever for marketers to gain a nuanced understanding.
So, what are third-party cookies? And how are they different from the other types of cookies, namely first-party cookies? Read on to find out.
Let’s run through definitions of first- and third-party cookies before taking a look at how they differ from one another.
What are first-party cookies? First-party cookies are created and stored by the website you are visiting directly. They are used to collect user data for analytics, remember language settings, and store login information.
As the name implies, third-party cookies are created and placed by third parties other than the website you are visiting directly. Some common uses include:
From the technical perspective, first- and third-party cookies are the same kind of files. The only difference lies in how they are created and used by websites.
First-party cookies are generated by the host domain. They are usually considered good because they help provide a better user experience. These cookies enable the browser to remember important user info, such as what items you add to shopping carts, your username and passwords, and language preferences.
On the other hand, third-party cookies are mostly used for tracking and online advertising purposes.
Here’s a table summarizing the key differences between first- and third-party cookies:
Today, users are demanding greater privacy, which includes transparency, choice and control over how their data is used. This means that marketers will have to pivot their advertising strategies since the availability and accessibility of cookies will continue to evolve.
Here’s how the third-party cookie phase-out is expected to affect marketers:
Epsilon's research on this industry shift shows that despite the impact and significance, fewer than half of marketers (46%) feel "very prepared" to market without third-party cookies entirely. Although third-party cookies are still being used in marketing, their availability has greatly decreased in recent years. For example, third-party cookies are not used at all on Apple devices, so any activity on Safari on an iPhone or iPad can not be recognized for ad-serving with those cookies.
If your marketing strategies rely on third-party cookies, it’s time to start exploring alternatives. Look to partners who can provide a stable and scalable ID graph with limited reliance on third-party cookies. Explore tools that can better help you leverage first-party and transactional data. And if you have limited or no first-party data, seek out vendors and partners that do have access to consented first-party data to identify and reach customers across the web. Because publishers have a direct relationship to the visitors to their sites and apps, it’s important to work with them—or vendors who do—to continue personalizing messages with the help of their first-party data.
Still not sure how to pivot your advertising strategies during the third-party cookies phase-out?
Because Epsilon identity resolution capabilities, also known as our COREid, is anchored in deterministic purchase data from individuals, it has limited dependence on third-party cookies. The integrity of this purchase data allows us to have 96% accuracy and industry-leading match and reach rates. As a result, we are able to identify and serve 98% of our ads to individuals, not orphaned cookies or device IDs.
Epsilon’s direct relationships with over 5000 publishers also help us continue to reach consumers without using third-party cookies, because through these relationships we are still able to:
Our years of preparation building people-based identity with first-party strategies and relationships will enable us to continue delivering results for our advertisers, while still providing performance transparency.
Cookies are pieces of data, and future-proofing your marketing strategy always comes back to your data strategy. If you want to build a data strategy that works for today and into the years to come, download our whitepaper for strategic recommendations on how to get your data in order for the marketing of tomorrow.
This article was published on September 22, 2023, and has since been updated.
