“Topics”, as this is the name of the new option, is about to use some kind of software which is built in your Chrome browser. It will track your browsing history and, based on what you have been searching for, it will suggest some topics which you are interested in.
However, you need to know that those topics are being stored for only three weeks. You will be provided with only three topics – one chosen topic for a week. After that, the old ones will be automatically deleted.
The announcement also says that now users will be given an opportunity to see and control how their data is being shared. Also, online businesses will also no longer be able to interact with tracking techniques such as fingerprinting in order to continue serving relevant ads.