ZTerm is a shareware terminal emulator for Macintosh operating system. It was introduced in 1992 for System 7 and has been updated to run on macOS. Its name comes from its use of the ZModem file transfer protocol, which ZTerm implemented in a particularly high-performance package. In contrast to the built-in macOS Terminal app, which only communicates with other programs, ZTerm only communicates with hardware serial ports.