Software testing is the process of evaluating and verifying that a software application or system meets specified requirements and functions correctly. It involves executing software to identify defects, ensuring that the product is free from bugs, and validating that it performs as expected. Here are some key aspects of software testing:

Types of Software Testing
Manual Testing: Involves human testers executing test cases without the use of automated tools. It includes:

Exploratory Testing: Testers explore the application without predefined test cases to identify issues.
Ad-hoc Testing: Informal testing without any formal test planning or documentation.
Automated Testing: Uses software tools to execute test cases automatically. Common types include:

Unit Testing: Tests individual components or units of the software.
Integration Testing: Tests the interaction between integrated components or systems.
Functional Testing: Validates that the software functions according to requirements.
Performance Testing: Assesses how the software performs under various conditions, such as load and stress.
Regression Testing: Ensures that new changes or additions haven't broken existing functionality.

Levels of Software Testing
Unit Testing: Focuses on individual units or components of the software.
Integration Testing: Tests the interactions between integrated units or components.
System Testing: Evaluates the complete and integrated software system.
Acceptance Testing: Verifies if the software meets the acceptance criteria and is ready for deployment. This can include:
User Acceptance Testing (UAT): Conducted by the end users to ensure the software meets their needs.
Operational Acceptance Testing (OAT): Checks if the software is ready for operational use, including maintenance and support.

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