What does "object literal" mean in JavaScript?

The literal represents how to express this value, generally removing the expression, assigning a value to the variable, the right side of the equal sign can be considered literal.
The literal is divided into string literals (string literal), array literals (arrays literal), and object literals (objects literal), plus the function literal (functions literal).
Example:
var test= "Hello world!";
"Hello world!" Is the string literal, and test is the variable name.

What does "object literal" mean in JavaScript?