A small, practical reference book or handbook designed to be easy to carry and use, typically containing useful information.
Compound of 'handy' (from Middle English, meaning convenient or easy to use) and 'book' (Old English 'boc'), a term for compact reference guides.
Before smartphones, 'handybooks' were the original PDAs—pocket-sized guides on everything from etiquette to mechanics. They show that people have always wanted information condensed into portable, practical forms.
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