I wish you an illustrious new year as well! The others refers to a specific group, usually rather small. If you are expecting five people to arrive, and you know who will be coming, but only three arrive, you can say: Where are the others?
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Fandorin So, the others is used with things which we know or from specific group we have already known?You need not know those people personally but you need a specific group to use the definite article (the).