Solaris is a Unix-based operating system introduced by Sun Microsystems in 1992 as the successor to SunOS.
Solaris is known for its scalability, especially on SPARC systems, and for being the origin for many innovative features such as DTrace and ZFS. Solaris supports SPARC-based and x86-based workstations and servers from Sun and other vendors, with efforts underway to port to additional platforms.
Solaris is certified against the Single Unix Specification. Although it was historically developed as proprietary software, it is supported on systems manufactured by all major server vendors, and the majority of its codebase is now open source software via the OpenSolaris project.