When the premises provide conclusive grounds for the conclusion, the reasoning is

When the premises give conclusive, necessitating grounds for the conclusion, the reasoning is deductive.

Here the truth of the premises makes the conclusion inescapable, not merely probable.

The link is one of necessity, so a valid deduction cannot have true premises and a false conclusion.

Inductive reasoning, by contrast, offers only probable support.

This guarantee of the conclusion by the premises is the hallmark of deduction.