Type Check - If you only want numbers to be entered. (E.G if you are writing the quantity of items you are selling in a shop)
Range Check- When you want to make sure that the data typed is within a range.( E.G. if you only want people over 18 to buy alcohol .. >=18 )
Presence Check - When you want to make it compulsory that certain data is entered.(E.G if you want to make sure someone fills in their age on a form)
Picture of Format Check - When you want to make sure that numbers and letters are in the right format. (E.G a postcode)
Check didgit - when you want to check a range of numbers have been entered correctly (E,G a barcode with a certain number at the end)
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