parameters: required inputs for a procedure
arguments: values in procedure calls stored as parameters

PROCEDURE hello_world(first_name, last_name)
{
    DISPLAY("Hello ")
    DISPLAY(first_name)
    DISPLAY(" ")
    DISPLAY(last_name)
}

hello_world("Willie", "Wildcat")

hello_world("Willie", "Wildcat")

Hello Willie Wildcat

PROCEDURE hello_world(first_name, last_name)
{
    DISPLAY("Hello ")
    DISPLAY(first_name)
    DISPLAY(" ")
    DISPLAY(last_name)
}

PROCEDURE main()
{
    hello_world("Willie", "Wildcat")
}

main()