Error occur because commands haven't not been entered or use correctly. Everything is flawed.
Syntax errors are errors that are to do with how code is entered such as typos.
Logical errors are errors where the syntax is correct but the logic in the problem is wrong, such as a program where dividing by 0 occurs.
Test data.
Valid= test data that represents typical input into the valid system.
Valid extreme= test data that is valid but at the extreme end of the range of acceptable.
Invalid= Test data that is out of range and should be rejected.
Invalid extreme= test data that is invalid but only just at the limit of being unacceptable
Erroneous= test data that should be rejected because it is the wrong type of input.
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