Account-based marketing (ABM), also known as key account marketing, is a strategic approach to business marketing in which an organisation considers and communicates with individual prospect or customer accounts as markets of one.
Key acccount marketing, Strategic account marketing
Buzzword alert: We're seeing this pretty new term being used in various contexts by different software vendors claiming they do "accoung based marketing". Unfortunately, as it turns out, they are in many cases simply rebranding an old feature to lure in uneducated buyers. So, be careful out there.