What Is Retargeting & Remarketing

Re targeting :-

Retargeting is the general term that refers to online search and display ads that target users based on cookies.

Re marketing :-

Remarketing has historically been a general term that refers to collecting user information and using it to market or remarket to them later. This has most often been done using direct mail or email. Google has borrowed this term for their version of retargeting campaigns that are run directly inside the Adwords platform.