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Top 10 List of Week 01

1. Virtual Machine
   A virtual machine is an emulation of a physical computer. They are often referred to as a guest while the physical machine they run on is referred to as the host.

2. Virtual Memory
   Virtual Memory is a storage allocation scheme in which secondary memory can be addressed as though it were part of main memory which creates the illusion of a very large main memory.

3. Vi
   Vi is a text editor that has two modes: command mode and insert mode. The commands that I used the most during this week is I to insert the text, d to delete, and :x to save and quit.

4. Bash (shell)
   Bash is a command processor that let us write commands. Prior to this, I already knew some basic bash commands such as cd, ls, mkdir, rm, and mv. The new commands that I used during this week is history, alias, and cat.

5. Free Software
   Free software is a software that have these for freedoms.
   Freedom 0: The freedom to run the program for any purpose.
   Freedom 1: The freedom to study how the program works, and change it to make it do what you wish.
   Freedom 2: The freedom to redistribute and make copies so you can help your neighbour.
   Freedom 3: The freedom to improve the program, and release your improvements (and modified versions in general) to the public, so that the whole community benefits.

6. Open Source
   Open source is a broad software license that makes source code available to the general public with relaxed or non-existent restrictions on the use and modification of the code.

7. copy left
   Copyleft is a general method for making a program (or other work) free (in the sense of freedom, not “zero price”), and requiring all modified and extended versions of the program to be free as well.

8. Hypervisor
   A hypervisor is software that creates and runs virtual machines (VMs). A hypervisor, sometimes called a virtual machine manager (VMM), allows one host computer to support multiple guest VMs by virtually sharing its resources, such as memory and processing.

9. Hypervisor Types
   Type 0 hypervisors are implemented in the hardware and require modifications to the operating system to ensure proper operation.
   Type 1 hypervisors provide the environment and features needed to create, run, and manage guest virtual machines.
   Type 2 hypervisors are simply applications that run on other operating systems, which do not know that virtualization is taking place.
   Source: OSC book.

10. Virtualization
    Virtualization is a method for providing a guest with a duplicate of a system’s underlying hardware. Multiple guests can run on a given system, each believing that it is the native operating system and is in full control. Source: OSC Book