Suffix for many a sharable computer file

• Doc alternative
• Alternative to a Word file
• Extension on many e-mail attachments
• Email attachment, often
• Shareable doc format
• File type developed by Adobe
• Adobe file format: Abbr
• Sharable file

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
by 1992, initialism (acronym) for portable document format , a generic term.