What does UDP provide that is not provided by IP?

What is the services difference between IP and UDP?
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"UDP provides the source and destination port addresses and a checksum that covers the data field. These functions would not normally be performed by protocols above the transport layer. Thus UDP provides a useful, though limited, service."
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"UDP provides a connectionless datagram support that provides ideal-energy supply, so that UDP isn't going to promise supply or maybe authenticate sequencing for any datagrams. An origin number that really needs dependable transmission have to work with sometimes TCP or even a system providing you with a sequencing and thank you providers. "
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