This document summarizes information about Linux and Unix operating systems. It discusses the pronunciation of Linux, defines what Linux is, lists some of its key features like being multi-user and multi-tasking, and notes some limitations such as a lack of standard edition and less support for drivers than Windows. It also provides a brief history of Unix, describing it as originally a one-man project in the 1960s, and outlines some of its features like multi-tasking and networking and limitations such as an unfriendly user interface and lack of guaranteed response times.