"text"
When used before and after characters, quotation marks (") indicate that the characters have a literal value and are considered a string, not a variable, numerical value, or other ActionScript element.
text : String - A sequence of zero or more characters.
The following example uses quotation marks (") to indicate that the value of the variable yourGuess is the literal string "Prince Edward Island" and not the name of a variable. The value of province is a variable, not a literal; to determine the value of province, the value of yourGuess must be located.
var yourGuess:String = "Prince Edward Island";
submit_btn.onRelease = function() { trace(yourGuess); };
// displays Prince Edward Island in the Output panel
// writes Prince Edward Island to the log file