What is dependency injection in Magento 2?

Dependency injection is one of the most widely used design patterns in Magento 2. It allows developers to add a dependency to a calling framework or a module. In Magento and other programming languages, dependency injections are often explained as the Hollywood principle.

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As for the advantages, here are the main benefits of using Magento dependency injections:

Improves code reusability.

Makes code easier to test.

Promotes hassle-free app maintenance.