Data Validation With Javascript:
Data validation is the process of ensuring that data (Normally entered into a form of some kind) is in the same format as you want and expect it to be in.
For example, if you ask someone to type in their birth month and you want them to use the textual label for the month rather than the numerical representation (i.e "February" rather than "2" or "02") then using datavalidation you should test that the end user is typing in the textual label for the month.
