Qeustion about Control bone in animation

I am new here and newbie about blender,

I have made some simple skeletion animation and want to export to external game engine,

and i have a question, i have no idea that if the control bones like IK needed to be exported? or only deform bone is needed?

I use the meta-rig for my human animation, but there are too many control bones, i don’t know if they are necessary to be exported.

thanks very much!

I might be able to answer your question if you attached a picture (screenshot) or the .blend file.
(BTW, I wouldn’t announce you’re new. People here seem to have something against newbies)