Can you explain what is meant by 'unit' in the context of software development?

In the context of software development, the term "unit" usually refers to the smallest testable part of the code — for example, a function, method, or class.

Unit testing is the process of verifying such units of code for correctness in isolation from the rest of the system.

For example, in Android development, a unit can be:

• A separate method that performs calculations.
• A class that implements business logic.

The goal is to ensure that each part works correctly on its own, which makes it easier to find errors and maintain the code.