Today, many different types of data validation techniques are used. Among them are:

Field-level validation: Validation is performed across all fields to ensure that the data entered by the user is error-free.
Form-level validation: Form-level validation occurs after the user has completed working with the form but before the information is saved.
Data saving validation: This type of validation occurs when a file or database record is saved.
Validation of search criteria: This type of validation is used to ensure that valid results are returned when a user searches for something.