An active volcano means that it still erupts.An inactive volcano means that it doesn't erupt.Inactive volcanoes can also be known as extinct (no longer erupt) or dormant (sleeping - but could still...
you can get active, dormant (or sleeping) and inactive volcanoes.
an active volcano is one that is very likely to erupt in the future and still has magma in it.
a dormant (or sleeping) volcano is...