They lack support for Unicode information. While Type 1 fonts are still supported by some operating systems, they aren’t supported on the web or with mobile OSs. Beginning in 1996, Adobe products and type development was switched to the much more versatile OpenType format, co-developed with Microsoft. Type 1 fonts were introduced by Adobe for use with its PostScript page description language in 1984, and it was widely used in the early days of desktop publishing. (Adobe Photoshop will end support for Type 1 fonts in 2021, as announced in 2019.)
Adobe announced in a Help document published Januthat they would discontinue support in their software for PostScript Type 1 fonts for authoring (including creating new content or editing existing content) in January 2023.
