Difference between Null and Invalid

Null

Part of speech: adjective

Definition: Having no legal validity, "null and void" insignificant absent or non-existent of the null set of or comprising a value of precisely zero causing a complete loss of gene function, amorphic.

Part of speech: verb

Definition: to nullify

Part of speech: noun

Definition: A non-existent or empty value or set of values. Zero; nothing. the ASCII or Unicode character (), represented by a zero value, that indicates no character and is sometimes used as a string terminator. the attribute of an entity that has no valid value.

Invalid

Part of speech: adjective

Definition: Not valid; not true, correct, acceptable or appropriate.Intended for use by an invalid.

Part of speech: verb

Definition: To exempt from duty because of injury or ill health.

Part of speech: noun

Definition: One who is confined to home or bed because of illness, disability or injuryAny person with a disability.

Example sentence: It's valid that the Strokes and the Pleased have been influenced by some of the same bands. But it's invalid in the sense that we listen to the Strokes and try to sounds like them. I think that they are a good band.