In what cases and why are dependencies used in software development?

Dependencies in development are external libraries, packages, or modules that a project uses to extend functionality without having to write everything from scratch. In Flutter, dependencies are used for:

• Increasing development speed — ready-made solutions for UI, networking, databases, etc., can be utilized.
• Support and updates — dependencies are often updated, bug fixes are applied, and new features are added.
• Separation of concerns — instead of monolithic code, specialized packages can be used.

For example, to work with HTTP requests, a dependency http is often added to pubspec.yaml:

dependencies:
  http: ^0.13.0

This allows for quick and convenient network requests without implementing them manually.