Literal

Literals represent values in JavaScript. These are fixed values—not variables—that you literally provide in your script.

Array literals Boolean literals Floating-point literals Numeric literals Object literals RegExp literals String literals

A string literal is zero or more characters enclosed in double (“) or single quotation marks (‘). A string must be delimited by quotation marks of the same type (that is, either both single quotation marks, or both double quotation marks).