Sun Microsystems introduced UNIX-based commercial workstations through its Sun-1 computer.
Sun Microsystems was founded in 1982 by Andreas Bechtolsheim, Vinod Khosla, Scott McNealy, and Bill Joy. Its name came from the Stanford University Network project, and its early hardware was based on Bechtolsheim’s Stanford University workstation design. The Sun-1 used the Motorola 68000 processor and ran the SunOS operating system, a UNIX variant.
Sun’s engineering work helped popularize networked workstations and the idea that computing resources could be connected across a network rather than concentrated in one large machine. Its systems became important in universities, engineering firms, and internet infrastructure during the 1980s and 1990s.
The question concerns Sun’s commercial workstation history, not the invention of UNIX itself. UNIX was created at Bell Labs in 1969 by Ken Thompson, Dennis Ritchie, and colleagues. Sun later became especially associated with SPARC processors, Solaris, and Java.