A company has Person Account set up on their Sales Cloud and they now want...

Syncing Person Account object can help map subscriber data in Marketing Cloud when the company has Person Account set up on their Sales Cloud. This can enable bi-directional data integration between Sales Cloud and Marketing Cloud for Person Accounts, which are records that combine both Account and Contact information for individuals. References:

https://help.salesforce.com/s/articleView?id=sf.mc_co_person_accounts.htm &type=5