What is the file structure database that Microsoft originally designed for floppy disks?

The file structure database that Microsoft originally designed for floppy disks is called "Microsoft Access." However, it's important to note that Access itself was not specifically designed for floppy disks; rather, it evolved as a desktop database management system for Windows environments. Before Access, Microsoft developed the "dbase" file format for database management, which was popular during the early days of personal computing and was frequently used on floppy disks.