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If you are looking for an answer to the question What is Artificial Intelligence? and you only have a minute, then here's the definition the Association for the Advancement of Artificial Intelligence offers on its home page: "the scientific understanding of the mechanisms underlying thought and intelligent behavior and their embodiment in machines."
However, if you are fortunate enough to have more than a minute, then please get ready to embark upon an exciting journey exploring AI (but beware, it could last a lifetime) …
PyTorch is the python version of Torch (a lua framework), which is a much older ML framework going all the way back to the early 2000s. Chainer only goes back a few years from what I can see, so your core assumption is slightly wrong.