guys please! if anyone could help me with the meaning of this terminology in java programming?

Question

METHOD

Answer 1

if we need a program (asmd) add subtract multiplication division if we write whole code in main method then if any error occurs in our program we need to check whole code for debug at this place if we use function add() for add and sub() for subtract and so on now if the error occurs the compiler tell us in which module error occurs.....that s why we need functions......

Answer 2

Do you know what are functions?