Channel Lifecycle
Your store will have a default channel that can be deleted, but at least one channel is always required. Channels have single currency and can not be changed after creation.
Creation
Channels are assigned to a single currency during creation and can not be changed afterward.
Activation
Channels can be activated and deactivated, affecting the channel's discoverability by the front end, which can be useful during the configuration phase.
Removal
You must first migrate the existing orders to a channel with the same currency to remove a channel.