Are there any differences between conventional weapons and non conventional weapons?

Answer 1

Conventional means accepted standards.

Conventional weapons are normal weapons that most nations possess; warships, airplanes, artillery, tanks, Machineguns, etc.

Un-Conventional Weapons are weapons that most nations do NOT possess. Nuclear Weapons would be un-conventional weapons. An un-heard of primitive weapon might be considered an un-conventional weapon.

The term can also be applied to warfare itself: Un-Conventional Warfare might be guerrilla warfare; Conventional warfare would be traditional Armies fighting against another Army.