The following are the major differences between product cost and period cost: 1  Product Cost is the cost which can be directly assigned to the product. 2  Product Cost is based on volume because they remain same in the unit price, but differ in the total value.
Communication protocol. In computing, a protocol or communication protocol is a set of rules in which computers communicate with each other. The protocol says what part of the conversation comes at which time. It also says how to end the communication.
CardDAV is an open Internet protocol (or standard) for syncing contacts, like IMAP for email and CalDAV for calendars. Itâs built around the HTTP-based WebDAV protocol and uses vCard format for contact data. âOpen protocolâ is just nerd speak for a standardized method of handling a common procedure.