Range Check, A number or data is within a sensible/allowed range, Type Check, Data is the right type such as an integer or a letter or a text, Length Check, Text entered is not too long or too short, Presence Check, Checks whether data has been entered, Format Check, Checks the correct format is used, Lookup Table, Checks the data against a list of valid entries, Spell Check, Indicates words spelled wrong, Check Digit, A number added to a string of numbers for error detection purposes

Input Validation

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