FLoC stands for Federated Learning of Cohorts which aims to target advertising better without it directly relying on singularly personal information. https://web.dev/floc/ FLoC enables ad selection without sharing the browsing behaviour of individual users. FLoC provides a privacy-preserving mechanism for interest-based ad selection. As a user moves around the web, their browser uses the FLoC algorithm to work out it…
It is a very similar feature to Apple Segments[1] already implemented in iOS on which sadly not a lot of documentation is available. [1]: https://support.apple.com/en-us/HT205223
This shouldn't exist in your operating system at all.