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Validation

Data Validation is a check on data input before processing 
to make sure it is reasonable / sensible NOT correct.                        E.G. Google Sign Up

Presence

Cannot be Blank

E.g. Username

Range

Within a range

E.g. Student Age 16-19

Format

Correct Pattern

E.g. Date DD/MM/YYYY

Length

Number of Characters

E.g. Phone Number

List / Lookup

List of acceptable values

E.g. Country

Cross Field

One field depends on another

E.g. Days in a Month

Check Digit

Result of a calculation

E.g. ISBN & Barcode

Type

Form of Data

E.g. Number

Verification is a check on data’s accuracy.
Double Check or Proof Reading.
E.G. password (double check) / reCAPTCHA

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