What are deductive arguments?

Deductive arguments are those arguments which claim that the truth of all the premises of the argument implies that the conclusion must necessarily be true.

Deductive arguments are those in which the relationship between the truth of the premisses and the truth of the conclusion is often expressed by saying that the truth of premises necessitates the truth of the conclusion, or in other words, if the premises are all true, the conclusion must be true. Arguments which exhibit this type of relationship are called "deductively valid arguments." All arguments which present themselves as making the claim that the truth of the premises necessitates the truth of the conclusion may be considered "deductive arguments," but only those for which this claim is in fact true are valid deductive arguments.

Deductive logic studies techniques for determining the validity of deductive arguments.