What is an unhandled promise rejection?

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For learning Angular 2, I am trying their tutorial.

I am getting an error like this:

(node:4796) UnhandledPromiseRejectionWarning: Unhandled promise rejection (r                                                                                                     ejection id: 1): Error: spawn cmd ENOENT
[1] (node:4796) DeprecationWarning: Unhandled promise rejections are deprecated.
In the future, promise rejections that are not handled will terminate the Node.
js process with a non-zero exit code.

I went through different questions and answers in SO but could not find out what an “Unhandled Promise Rejection” is.

Can anyone simply explain me what it is and also what Error: spawn cmd ENOENT is, when it arises and what I have to check to get rid of this warning?

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