1 00:00:00,120 --> 00:00:02,370 ‫Instructor: Hi, within this lecture 2 00:00:02,370 --> 00:00:05,400 ‫we are going to discuss what is a virtual machine 3 00:00:05,400 --> 00:00:09,960 ‫and why do we need one in order to follow this course. 4 00:00:09,960 --> 00:00:11,760 ‫So we are going to work 5 00:00:11,760 --> 00:00:15,120 ‫with different kind of operating systems within this course. 6 00:00:15,120 --> 00:00:18,450 ‫For example, we can use a color Linux 7 00:00:18,450 --> 00:00:21,840 ‫which is a Linux version, a Linux distribution 8 00:00:21,840 --> 00:00:25,530 ‫which we will see in a couple of minutes, okay? 9 00:00:25,530 --> 00:00:27,510 ‫And in order to do that 10 00:00:27,510 --> 00:00:31,140 ‫you can either delete your own operating system 11 00:00:31,140 --> 00:00:32,580 ‫from your own computer 12 00:00:32,580 --> 00:00:35,460 ‫and install the other operating system 13 00:00:35,460 --> 00:00:39,240 ‫that you may want to use as a main operating system. 14 00:00:39,240 --> 00:00:42,690 ‫Or you can run it virtually using a software 15 00:00:42,690 --> 00:00:46,230 ‫called Virtual Box, for example. 16 00:00:46,230 --> 00:00:51,230 ‫So this virtual machines will allow us to use different kind 17 00:00:51,930 --> 00:00:55,410 ‫of operating systems anytime we need them. 18 00:00:55,410 --> 00:00:59,970 ‫For example, by using virtual machines, we can use Linux, 19 00:00:59,970 --> 00:01:04,440 ‫we can use Windows or other operating systems virtually 20 00:01:04,440 --> 00:01:08,370 ‫in our own machine whenever it's needed. 21 00:01:08,370 --> 00:01:11,820 ‫We can run multiple machines at once 22 00:01:11,820 --> 00:01:14,730 ‫and it will be much more safer for us to use 23 00:01:14,730 --> 00:01:15,930 ‫a virtual machine. 24 00:01:15,930 --> 00:01:18,210 ‫So if we kind of break it 25 00:01:18,210 --> 00:01:20,730 ‫or if we kind of do something wrong, 26 00:01:20,730 --> 00:01:24,150 ‫we can delete it and we can rebuild it within minutes 27 00:01:24,150 --> 00:01:26,370 ‫because it will be virtual. 28 00:01:26,370 --> 00:01:30,360 ‫So it's recoverable, we can go back to any state 29 00:01:30,360 --> 00:01:33,030 ‫that we want, anytime we want. 30 00:01:33,030 --> 00:01:35,430 ‫We can just install the latest version 31 00:01:35,430 --> 00:01:39,720 ‫or some different earlier version for task purposes. 32 00:01:39,720 --> 00:01:44,010 ‫So it allows us to do whatever we want freely 33 00:01:44,010 --> 00:01:46,080 ‫and it's literally free as well 34 00:01:46,080 --> 00:01:48,930 ‫because the Virtual Box is free 35 00:01:48,930 --> 00:01:51,390 ‫which is the software that we are going to use 36 00:01:51,390 --> 00:01:54,180 ‫in order to run our virtual machines. 37 00:01:54,180 --> 00:01:56,880 ‫And the virtual machines are free as well. 38 00:01:56,880 --> 00:01:59,250 ‫So this will be a very good idea 39 00:01:59,250 --> 00:02:01,140 ‫in order to follow this course. 40 00:02:01,140 --> 00:02:03,210 ‫And if you wonder what it looks like 41 00:02:03,210 --> 00:02:04,800 ‫it looks like something like this 42 00:02:04,800 --> 00:02:06,600 ‫you're going to see within a minute. 43 00:02:06,600 --> 00:02:09,270 ‫But as you can see, this is the Virtual Box, 44 00:02:09,270 --> 00:02:11,580 ‫the software that I was talking about. 45 00:02:11,580 --> 00:02:15,690 ‫And for example, I am running a Linux version over here 46 00:02:15,690 --> 00:02:18,630 ‫in my own machine, even though I'm using 47 00:02:18,630 --> 00:02:23,630 ‫a MacBook right now, I can see the color Linux over here. 48 00:02:23,640 --> 00:02:26,250 ‫So this is where, what you're going to do 49 00:02:26,250 --> 00:02:28,260 ‫with virtual machines. 50 00:02:28,260 --> 00:02:30,930 ‫And within the next section we are going to see 51 00:02:30,930 --> 00:02:35,520 ‫how we can install this Virtual Box and the other stuff, 52 00:02:35,520 --> 00:02:37,800 ‫and how we can do the settings for them 53 00:02:37,800 --> 00:02:42,273 ‫in order to run them efficiently on our own host computers.