1)White Box Testing: Definition: Tests internal structures or workings of an application. Knowledge Required: Requires knowledge of code and algorithms. Focus: Examines code paths, branches, and functions. Advantages: Identifies hidden errors, ensures thorough testing. Disadvantages: Requires skilled testers and can be complex. 2)Black Box Testing: Definition: Tests software from an external perspective without knowledge of internal code. Knowledge Required: No coding knowledge needed. Focus: Assesses functionality and user interactions. Advantages: Simulates user experience and validates requirements. Disadvantages: May miss internal defects and is less thorough.