What are the different release executables for? icloud, icloudpd, & icloudpd-ex

[turpie]

What are the different release executables for?
The are versions starting with "icloud", "icloudpd", & "icloudpd-ex". Is there any reason to choose one over the other?

[AndreyNikiforov]

icloudpd is the one you need to download photos. icloud is a tool to maintain passwords in keyring. icloudpd-ex is an Experimental version of the icloudpd