In a large enterprise, a single word can mean different things to different departments. For example, the word "Product" means something very different to a warehouse manager (dimensions, weight, shelf location) than it does to a sales marketer (price, discount code, images).
Distinguishing things with identity from things defined by their attributes.
Evans introduces several strategic and tactical patterns designed to manage complexity. 1. Strategic Design (Context Mapping) domain driven design eric evans epub 18
Objects defined by a unique thread of continuity and identity, rather than their attributes. A Customer is an entity; even if they change their name, address, and email, they are still the same unique customer.
Objects that describe some characteristic of the domain but have no conceptual identity. In a large enterprise, a single word can
Establishing a common, shared language between developers and business experts to prevent misunderstandings 0.5.2.
Instead of re-inventing the wheel, Evans argues that you should mine "Analysis Patterns"—standard, reusable model fragments discovered by others (often referencing Martin Fowler’s work). The feature of this chapter is that it treats modeling not just as a creative art, but as a research task. A Customer is an entity; even if they
[ Aggregate Root ] │ ├─── [ Entity ] (Id: 123) │ └─── [ Value Object ] (No Identity) Entities vs. Value Objects