Why are some parameters in quotation brackets?

Question

function sayHello(name, age) {
document.write( name + " is " + age + " years old.");
}

sayHello("John", 20)
//Outputs "John is 20 years old."
why is john in "

Answer 1

Because John is a string.

Answer 2

It will be hilarious if someone named John came in and go like "Hey, I'm not a string."

Answer 3

"John" is a string
John would be a variable
20 is integer
"20" is string
:)

Hope this helps, even a bit.

Answer 4

Thanks for the help guys :D