Also known as: cookie matching, cookie mapping, ID syncing, ID matching, user-ID mapping
The process of sharing a user identifier stored in a Cookie between platforms in order to exchange information about the user. The main goal of Cookie syncing is to improve Ad targeting.
![How cookie syncing works between two AdTech platforms, for example, between a DSP and a DMP](https://clearcode.cc/app/uploads/2015/12/Copy-of-Lambda@Edge-Cookie-Sync.jpg)