Control surfaces.
Flaps are terminology for a specific type of control surface. Flaps change the area, and/or camber of the wing, augmenting lift.
Your standard control surfaces are ailerons are for roll, elevators are for pitch, and rudders are for yaw.
Of course, you can use the wing-part control surfaces to make flaps, but you're limited to what type you can make with them alone.
I wish there a part for various flap-types. Building slotted fowlers from scratch is pretty tough.

and U & O for the rudders by the way

yeah i discovered that before, i didn't tell to anyone coz' i thought they knew already, i think they added that to check if the flaps are hitting together. but it won't move on a custom flaps ( hinge )

Yeah I knew lol.

@iLikeipads no

Cool I don't know that

@chancey21 @communisticbanana me 2 XD

i knew this

I already knew this but few people do

Cool