Parameters are named variables declared as part of a function. They are used to reference the arguments passed into the function. See parameter in MDN 
In computer programming, a parameter or a formal argument is a **special kind of variable used in a subroutine** to refer to one of the pieces of data provided as input to the subroutine.[a][1] These pieces of data are the values[2][3][4] of the arguments (often called actual arguments or actual parameters) with which the subroutine is going to be called/invoked. An ordered list of parameters is usually included in the definition of a subroutine, so that, each time the subroutine is called, its arguments for that call are evaluated, and the resulting values can be assigned to the corresponding parameters.
https://en.m.wikipedia.org/wiki/Parameter_(computer_programming)
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