Domain

Definitions

In domain-driven design, the subject area or business problem a software system addresses. In networking, a human-readable address (e.g., example.com) that maps to an IP address via DNS.
In plain English: Either the real-world problem your software solves (business domain) or a website address like google.com (network domain) — context tells you which.
Example: "Our domain model captures the lending rules — the framework is just plumbing around it."