Research testing.

Exploratory testing is an approach to software testing where the tester actively explores the application without predefined test cases to identify unexpected defects and understand the system's behavior.

Features:

• The tester uses their knowledge, experience, and intuition to find bugs.
• No strict script, testing is flexible and adaptive.
• Often used in early development stages or when studying new functionality.
• Allows discovering issues that are difficult to formalize into test cases.

Example: A QA engineer receives a new feature, launches the application, and tries to interact with it in various ways — entering non-standard data, checking boundary conditions, trying to break the logic to find errors.

This method complements automated and regression testing well, improving product quality.