Explain Google AdWords Remarketing?

By displaying pertinent advertising to people who have already visited your website, used your mobile app, or are in your CRM databases through remarketing, you may reach out to them and market to them.

A short piece of code (remarketing code) on your website adds users to a remarketing list when they visit. They are then shown your ad when they go to another website that is part of the Google Ad network. You may choose who sees your remarketed advertising thanks to Google.