A deductive argument offers two or more assertions that lead automatically to a conclusion. The following is an example of a sound deductive sullogism.
All dogs have four legs.
Rover has four legs. A sound argument is one in which the premises guarantee the conclusions, and an unsound argument is one in which the premises do not guarantee the conclusions. A deduction can be completely true, yet unsound. It can also be sound, yet demonstrably untrue. Jimmy Carter was a Baptist.