The word null has different meanings. In law it means having no legal or binding force, invalid, in mathematics it means having or associated with the value of zero. In computer science, it is a special pointer value used to signify that a pointer intentionally does not point to an object.
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what does null mean
without value, effect, consequence, or significance.
being or amounting to nothing; nil; lacking; nonexistent.
being or amounting to zero.
Electronics. a point of minimum signal reception, as on a radio direction finder or other electronic meter.
VERB (USED WITH OBJECT)
to cancel; make null.
null and void without legal force or effect; not valid: This contract is null and void.
Null means nonexistent; no legal force; no consequence. It can also mean void like in the saying 'null and void'. That is the definition of what null means.
In computer terms null means nothing, as in blank data. When null is entered into a database it simply enters a blank. Null is often used to insert a blank field into a database which will be filled with data at a later time.