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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