Linux is Open source Operating System . It is more secure than other Operating System like Windows, Window 7, Window 8 etc.
Linux began in 1991 as a personal project by Finnish student Linus Torvalds to create a new free operating system kernel. The resulting Linux kernel has been marked by constant growth throughout its history.
Linux is used in the following ways: Server OS for web servers, database servers, file servers, email servers and any other type of shared server. Designed to support high-volume and multithreading applications, Linux is well-suited for all types of server applications. Desktop OS for personal productivity computing.
Learn Linux for Beginner 