Mac software used to be distributed on 3.5-inch floppy disks. Now, using the MacDisk utility, you can read them on modern Windows computers.

When the Macintosh was first released in 1984, it didn’t include any mass storage, a hard drive, or SSDs. Instead, it shipped with a 3.5-inch floppy disk drive designed by Sony.
Before the Internet, most personal computer software was sold and distributed this way. First on 8-inch floppies, then on 5.25-inch disks with the Apple II and IBM PC, and finally on 3.5-inch disks.