name for the input def total(numbers)this name is internal to the function our function takes single inputthe list of numbers to be summed what goes inside the brackets on the def line is the name that this list will have inside the function' definition this is the "xin maths this internal names is typically unrelated to the name the list has in the main body of the script it is always good idea to name your inputs (and other variablesmeaningfully please try to avoid calling them " "" "or "zwe will call ours "numbers