SILK is a speech codec developed by Skype whereas CELT is a general purpose audio codec developed by Xiph.org. Opus can use either of them (to encode speech or e.g. music, respectively) or it can use both codecs simultaneously for high-quality speech.
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Just checking, CELT & Opus are the same thing? Seems like they're saying that Opus is a merge of CELT & SILK
Yes, Opus is basically a merge of CELT and SILK.
SILK is a speech codec developed by Skype whereas CELT is a general purpose audio codec developed by Xiph.org. Opus can use either of them (to encode speech or e.g. music, respectively) or it can use both codecs simultaneously for high-quality speech.