Logical validity is a relationship between the premises and the conclusion such that if the premises are true then the conclusion is true. The major task of logic is to establish a systematic way of deducing the logical consequences of a set of sentences, or argument . It is necessary first to identify or characterize the logical consequences of a set of sentences. The procedures for deriving conclusions from a set of sentences then need to be examined to verify that all logical consequences, and only those, are deducible from that set. A deductive argument is said to be valid when the inference from premises to conclusion is perfect.
Validity is a property of the argument's form.
It doesn't matter what the premises and the conclusion actually say. It just matters whether the argument has the right form. So, in particular, a valid argument need not have true premises, nor need it have a true conclusion. If we don't accept the premises of an argument, we don't have to accept its conclusion, no matter how clearly the conclusion follows from the premises. Also, if the argument's conclusion doesn't follow from its premises, then we don't have to accept its conclusion in that case, either, even if the premises are obviously true.