I knew about TTF and PostScript Type 1 fonts, but learned of another format that's actually supported natively by Windows.
My youngest daughter is becoming a designer. She asked how to install a font she downloaded from an online source, such as DaFont. I told her to put it into the \Windows\Fonts folder. But she got stalled, because the download was a ZIP file.
I opened the ZIP file for her, and found an OTF file. "Wha?" I wondered. A google search quickly informed me that (1) OTF files are open text fonts, and (2) are supported by Windows. Sure 'nough, was true, and my daughter went on to happily design a T-shirt.
The OpenType format is an extension of the TrueType SFNT format that also can support Adobe PostScript font data and new typographic features. OpenType fonts containing PostScript data, such as those in the Adobe Type Library, have an .otf suffix in the font file name, while TrueType-based OpenType fonts have a .ttf file name suffix.
Does CAD support OTF?
I tried out AutoCAD 2008, but its Style command does not recognize .otf files. Its Compile command converts PostScript fonts for use in drawings, but it also does not recognize .otf files.
Non-CAD programs do, such as PaintShop Pro and the Atlantis word processor.