Test data: Invalid - GCSE Computer Science Definition

'Test data: Invalid' refers to information or input used when testing a computer program or system that is deliberately incorrect or does not follow the expected rules. The purpose of using invalid test data is to check how well a program can handle mistakes or unexpected entries without crashing or giving wrong results. For example, if a program asks for a number between 1 and 10, entering a letter or the number 15 would be considered invalid test data. This helps ensure that the software is robust and can manage errors correctly.