Plural of handbook; small reference books or manuals that provide concise information about a specific subject.
From hand + book, a compound word meaning a book small enough to hold in your hand. The term emerged in the 19th century with the printing revolution making portable books affordable.
Handbooks are the grandfathers of today's apps and websites—they were the original quick-reference tools, and their basic structure (clear headings, index, practical tips) inspired how we design digital information today.
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