Microsite definition: microsite refers to a branded website that is not part of a brand’s homepage or main website URL.
Microsites come in two forms:
They often expire once a marketing campaign is over.
Microsites are created to have a specific function or share content that would lose its impact if shared on a brand’s main website.
For example:
OfficeDepot has a microsite called ElfYourself that they drive traffic to during the holiday period. Users can create videos and images of themselves as elves to be shared.
This works as a form of viral marketing for them.