What is the difference between remote procedure call and web service?

I see this question. The question has been asked long time ago, but I think anyone's answer in this community, giving more information and clarity on this topic, will be helpful for the future questioners. So, I would like to add my enhancement pointing out key differences and I hope, it will be helpful for future readers.

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| Category             |    RPC              |    Web Services
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|Operation's Location  | On top of TCP       | on top of HTTP Protocol
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|Data format           | Binary              | Text, XML, JSON, ect.
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|Speed                 | Slow (Marshalling)  | Fast
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I have not mentioned descriptions of RPC and Web Services, because you see them in others' answer clearly.

Is Web Service a higher level representation of RPC?

Yes, it is. A web service is a specific implementation of RPC. At its lowest level, Web Service connects to the Socket, using the HTTP protocol, to negotiate sending a payload that is executed in a remote space (remote space can be the same computer). All these remote call abstractions, at its core, are RPCs.