[ Day 2 ] Server, Virtual Machine, Operating Systems Deep Dive.

A server is a computer that is used to provide services to other computers. It has a storage device, a computational device, and a kernel that manages all of these resources. The operating system is a software that communicates from the user end to the hardware and uses the hardware and resources to do a specific task for the user. A server has a kernel and some resources, but it doesn't have any operating system. The operating system is installed onto the server using booting. There are two types of operating systems: GUI and CLI. GUI means Graphical User Interface and CLI means Command Line Interface. Examples of GUI operating systems include Windows and Mac, and examples of CLI operating systems include Linux, Ubuntu, and CentOS.

A virtual machine is a software that creates a virtual computer environment on a physical computer. It is used to run multiple operating systems on a single server. A hypervisor is a software that manages multiple operating systems on a single server. Virtual machines are used to deploy applications and to manage resources more efficiently. Cloud providers such as AWS, Azure, and Google Cloud offer virtual machines as a service.