Undefined means a variable has been declared but has not yet been assigned a value. On the other hand, null is an assignment value. It can be assigned to a variable as a representation of no value. Also, undefined and null are two distinct types: undefined is a type itself (undefined) while null is an object. Unassigned variables are initialized by JavaScript with a default value of undefined. JavaScript never sets a value to null. That must be done programmatically.

If do not assign the value then this is called Null value & if we assigne like 5@ u8 This called undefiled

If do not assign the value then this is called Null value & if we assigne like 5@ u8 This called undefiled

If do not assign the value then this is called Null value & if we assigne like 5@ u8 This called undefiled

If do not assign the value then this is called Null value & if we assigne like 5@ u8 This called undefiled

If do not assign the value then this is called Null value & if we assigne like 5@ u8 This called undefiled