Oracle Solaris

Solaris is a proprietary Unix operating system originally developed by Sun Microsystems. It superseded the company's earlier SunOS in 1993. In 2010, after the Sun acquisition by Oracle, it was renamed Oracle Solaris.
What is it?

Solaris is known for its scalability, especially on SPARC (Scalable Processor Architecture) systems, and for originating many innovative features such as DTrace, ZFS and Time Slider. Solaris supports SPARC and x86-64 workstations and servers from Oracle and other vendors. Solaris was registered as compliant with UNIX 03 until 29 April 2019.
Main function

advanced security features, flexible user rights management that allows you to protect critical data;
undeniable performance advantages for web services, databases, and Java services;
high-performance network operation;
unlimited file system and database management capabilities;
full compatibility for solving hardware and software issues.
Functional capabilities

Sun Microsystems, Inc. (Sun for short) was an American company that sold computers, computer components, software, and information technology services and created the Java programming language, the Solaris operating system, ZFS, the Network File System (NFS), and SPARC microprocessors. Sun contributed significantly to the evolution of several key computing technologies, among them Unix, RISC processors, thin client computing, and virtualized computing. Sun was founded on February 24, 1982.

Oracle Corporation is an American multinational computer technology corporation headquartered in Redwood Shores, California. The company sells database software and technology, cloud engineered systems, and enterprise software products—particularly its own brands of database management systems. In 2019, Oracle was the second-largest software company by revenue and market capitalization.