Validation - A comptuer check to ensure that the data entered is sensible, reasonable and legal
Range Check - Data is between stated ranges (1 and 12 for months for DOB or delivery date/Students in secondary school are 11-18)
Format Check - Data must be in the correct pre-defined layout (Postcode, DOB)
Presence Check - Data must be present in certain fields (starred fields, @ in email address)
Length Check - Must have a certain number of characters (phone number, credit card 16 digits)
Data Type Check - Data must be of a specified type - numerical, text (year, quantity required)
Check Digit - Doing maths on a code number to generate an extra number on the end (ISBN, product code)
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