Files or documents appended to emails, or emotional bonds between people.
From Old French 'atachier' meaning 'to fasten', from 'a-' (to) and 'tache' (nail or fastening). The psychological meaning of emotional attachment developed in the 18th century, while the email meaning emerged in the 1990s.
The first email attachment was sent in 1992, but it took years for email systems to standardize how attachments were encoded and transmitted. The MIME (Multipurpose Internet Mail Extensions) standard, still used today, was developed to solve the chaos of incompatible attachment formats.
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