It has been a while since we talked about inherit vs noninherit summons. For this you should know the basics of chains. If you do not know what a change is, then I would recommend you spend a small amount of time in lesson 1.
Inherit: An inherit special summon is a special summon that does not start a chain. This includes xyz, synchro, and most monster effects that special summon themselves such as geargiaaccelerator and cyber dragon.
noninherit: A noninherit special summon is a special summon through a card effect that starts a chain. This includes polymerization, tour guide, and wind-up shark.
Why go over this?
Some cards can only negate one type of summon. For example, black horn of heaven says "When your opponent would special summon a monster..." because it said " would special summon " and never said anything about a card effect. This means it stops inherit special summons.