** Understanding Software Quality Assurance: The Intersection of Functional and Non-Functional Testing

As software development continues to evolve, ensuring the quality of a product is paramount. Two essential components in achieving this goal are functional and non-functional testing. These twin pillars of software quality assurance (SQA) serve different purposes and focus on various aspects of the product.

**Functional testing** validates a software system against its functional requirements and specifications, ensuring each feature works as expected. This type of testing checks the user interface, APIs, databases, security, client-server applications, and functionality of the application under test.

On the other hand, **non-functional testing** assesses aspects unrelated to specific functions, such as performance, scalability, security, compatibility, and usability. It verifies how well a system responds to requests, handles simultaneous users, behaves under stress, and interacts with other systems and platforms.

Both functional and non-functional testing are critical in the software development lifecycle (SDLC), offering unique value in delivering high-quality software products. By understanding and implementing both types of testing effectively, developers can achieve software excellence and meet user expectations.

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Source: https://dev.to/misterankit/functional-vs-non-functional-testing-navigating-the-landscape-of-software-quality-assurance-oe2