Decision Model and Notation (DMN) is a standard established by the Object Management Group (OMG) for describing and modeling operational decisions. DMN decision models can be shared between DMN-compliant platforms and across organizations so that business analysts and business rules developers are unified in designing and implementing DMN decision services.
Alongside Boxed Expressions (Data Tables, Context, Functions, Lists, etc.), the DMN specification defines the Friendly Enough Expression Language (FEEL) to define the logic of a decision in a DMN model.