Some people say that it is very rare. Truth be told this is NOT true. It is rare but not very rare. I have truly seen this a lot in my area. So, don't listen to the people who say it is very rare because they are lying (or they are blind).
BTW, while i was writing this answer i saw 3 cloud to cloud lightnings.
Lightning
Cloud lighting
This is called a cumulonimbus cloud.
Cumulonimbus is the largest type of cloud. It is the only cloud that is tall enough to occupy low, medium and high heights. It is also the only (weather related) cloud that can form hail and lightning. Lightning can also be created in volcanic ash clouds, but they are not a weather related cloud.
"ball lightning"
Inter-cloud lightning!
Sheet lightning is Cloud to Cloud where Lightning is Cloud to Ground.
It's called in-cloud or cloud-to-cloud lightning.
It's called in-cloud or cloud-to-cloud lightning.
Lightning is formed with a nimbocumilus cloud.
It's called in-cloud or cloud-to-cloud lightning.
cloud to cloud lightning
It's called in-cloud or cloud-to-cloud lightning.
Lightning is just really large static. Lightning between clouds is called cloud lightning or sheet lightning and is caused when one cloud has an excessive charge and another cloud has an excessive amount of the opposite cloud. The lightning is used to relieve the clouds charge.
Sheet lightning and heat lightning are descriptive terms rather than scientific. Sheet lighting is cloud to cloud lightning that is viewed from such a distance that there is no sound. Heat lightning can be either cloud to cloud or cloud to ground at same distance with the added element of color tinting from atmospheric particles as with a sunset.
The cloud sends down electrons to the ground and when it finds a substance lightning can travel through than a discharge travels up to the cloud, the lightning. If you stand on rubber lightning wont discharge.
Cloud flashes. Spider lightening is the type of cloud flash that you can visibly see outside of the cloud.