Are They "Component" or an "Actor"?

Hello everyone;
I know that maybe my question is weird, but i want to know the “DirectionalLight” and “ExponentialHeightFog” and “VolumetricCloud” are Components or actors?
I read somewhere that they are components, so why they are in “Place Actors” panel?
How about “Post Process Volume”? is it component?
Thanks for you helping!

Hey @Ali_Coder!

So when these things are attached to a blueprint, they are components. Say, if you make a car and give it headlights, those headlights are components of the car (likely a spot light).

However, when they are simply added to a level as part of the level blueprint, and not attached to an actor, they are “scene actors”, I believe.