What are the differences between namespaces and modules in TypeScript, and when should you use each?

• Namespaces are used for organizing code and avoiding naming collisions, living within a global scope. • Modules are designed for encapsulation; they define their own scope and can be imported/exported between files. • Use namespaces for internal code organization where global exposure is acceptable. • Use modules for building applications with clear dependencies and separation of concerns, which promote better scalability.