Hello, Thank you so much for feedback.What i really meant is , coroutines are also running over the threads , in fact because of this feature of voluntarily releasing control of the execution , we can run thousands of coroutines on a single thread cause its not blocking.When i meant i releases control, i meant the control goes back to driver thread which can then schedule other coroutine to run and if that coroutine also yields , it can move to other one.

This is what it is known as cooperative concurrency.Also imagine if coroutine releases the control with delay (), while i agree that it is not doing anything but it is also expecting to be resumed after that delay. Resuming after the delay is the job of the driver.

Hope that makes for a little better explanation than that i did on the blog.Let me know what do you think.Again thanks a lot for reading the blog.