this library solves a simple problem: removing all the code you need to map one object to another. A boring code to write and often replaced by less-performant alternatives.
AutoMapper uses a convention-based matching algorithm to match up source to destination values. AutoMapper is geared towards model projection scenarios to flatten complex object models to DTOs and other simple objects, whose design is better suited for serialization, communication, messaging, or simply an anti-corruption layer between the domain and application layer.