CTOL - means it has cables and catapults as per real carriers of the good old days.
STOVL - means it can accept vertical landings, but needs to be big enough to allow short take-offs. Similar concept to the little Invincible class Harrier carriers.
Who invented this stupid 'cats and traps' bolleaux? It had to be the same Spam numpty who came up with ridiculously oo-rah gung-ho term 'Warfighter'
.