What is the difference between undefined and null

Question

undefined vs null

Answer 1

undefined: a variable has been declared but hasn't been assigned a value.
var lol;

null: an assignment value for a variable as a representation of no value.
var lmao=null;

null == undefined // true
null === undefined //false

In this case, they have the same value but different type.

Answer 2

tnx Gabby