inpu va lidat ion input validation code checks that values entered by the usersuch as text from the input(functionare formatted correctly for exampleif you want users to enter their agesyour code shouldn' accept nonsensical answers such as negative numbers (which are outside the range of acceptable integersor words (which are the wrong data typeinput validation can also prevent bugs or security vulnerabilities if you implement withdrawfromaccount(function that takes an argument for the amount to subtract from an accountyou need to ensure the amount is positive number if the withdrawfromaccount(function subtracts negative number from the accountthe "withdrawalwill end up adding money