Does Android continuously notify the user to update the OS? I am wondering if Android notifies the user daily to update their OS like Apple's iOS does?  I'm a long term iOS user and the automatic software updates implemented recently has me considering switching over to Android.     I've never used or owned an Android and am curious what the experience is like.
Daily updates no, but it does depend upon the device provider. That is they have to customise the OS to suite the device.

My experience, on a Lenovo Tablet, is that updates are pretty low in frequency, less than on a monthly basis and applying the OS updates is not compulsory.