the difference between stringify JSON and parseJSON

First ,this syntax stringifyJSON is used with jquery but with JavaScript the syntax written like JSON.stringify(), also for the parseJSON is used With jquery and JSON.parse() in JS .

second, the difference between the work of StringifyJSON and parseJSON is doing the opposite what each one does . wich is StringifyJSON takes an object and transform it to a string of that object but, the parseJSON transform or re back the string of object to an object .