Unit testing (Unit Testing) primarily involves testing and verifying the smallest testable units within a program, such as functions or methods, with a focus on ensuring each component correctly executes its defined functionality. Unit testing is typically written by developers to ensure that each part of the code works as expected.
Functional testing (Functional Testing), also known as functional testing, involves testing software systems at a more macro level to ensure that various functionalities execute according to the requirements specification. Functional testing places greater emphasis on user interfaces and user requirements, ensuring that the software system as a whole meets user business needs.
In summary, unit testing focuses on the internal correctness of individual components, while functional testing focuses on whether the external behavior and functionality of multiple components or the entire system meet expectations when working together.