Unix: Why does the special character ? need to be escaped in grep, but not . or *?

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Why does the special character ? need to be escaped in grep, but not . or *?
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(unix.stackexchange.com/users/307666/dominic-van-der-zypen)Dominic van der Zypen
(unix.stackexchange.com/users/377345/adminbee)AdminBee
(unix.stackexchange.com/users/621018/eli-minkoff)Eli Minkoff
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grep regular-expression escape-characters




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