Can you explain the concept of domain-driven design (DDD)?

DDD (Domain-Driven Design) is an approach to software development that focuses on a deep understanding and modeling of the business domain. The main idea is to build software models that reflect real business processes and rules, so that the code is as close as possible to the subject area.

Key points of DDD:

• Domain-Driven Design: architecture and code structure derive from business requirements.
• Ubiquitous Language: developers and business experts use a common language reflected in the code.
• Bounded Contexts: large systems are divided into separate areas with clear boundaries.
• Entities and Aggregates: objects that have identity and invariants.
• Repositories and Services: for managing the lifecycle of objects and business logic.

Example: if you are developing a system for a bank, DDD will help create models that reflect accounts, transactions, clients, and business rules related to them, making the code understandable and easy to maintain.