What are packages/namespaces and why organize code that way?

Packages and namespaces

Packages (Java) / namespaces (C#, Python) group related types, control visibility, and prevent name clashes (com.acme.orders).

• Public API surface stays small; keep internals package-private.
• Maven/Gradle modules split deployable units with explicit dependencies.
• Import only what you need—avoid wildcard imports in interviews.