Software testing is the process of evaluating and verifying that a software application or system meets specified requirements and works as intended. The primary goal of software testing is to identify and fix defects, ensure quality, and improve the reliability and performance of the software. This process involves various activities aimed at detecting errors, gaps, or missing requirements in contrast to the actual requirements.

Key aspects of software testing include:

Types of Testing:

Functional Testing: Verifies that each function of the software operates according to the requirements. Includes unit testing, integration testing, system testing, and acceptance testing.
Non-Functional Testing: Evaluates aspects not related to specific functions or features, such as performance, scalability, security, usability, and reliability.
Testing Levels:

Unit Testing: Tests individual components or units of code, typically by the developers.