What does it mean that a method or field is "static"? (CoreJava)

Question :What does it mean that a method or field is "static"? (CoreJava)
Answer :Static variables and methods are instantiated only once per class. In
other words they are class variables, not instance variables. If you change
the value of a static variable in a particular object, the value of that
variable changes for all instances of that class.
Static methods can be referenced with the name of the class rather than
the name of a particular object of the class (though that works too). That's
how library methods like System.out.println() work. out is a static field in
the java.lang.System class.