Character Identifier Font (.cid)
The CID (Character Identifier) file extension, developed by Adobe, is used for CID-keyed fonts, which are composite (multibyte) Type 1 fonts designed to support large character sets, particularly for East Asian languages like Chinese, Japanese, and Korean. These fonts address glyphs by number rather than name, allowing for efficient handling of extensive character sets. Introduced to meet the demands of the Far East markets, CID fonts facilitate high-quality digital typesetting and printing by leveraging the PostScript language.