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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:11,560 --> 00:00:15,494 When we interact with our computers we use our mouse, keyboard or 2 00:00:15,494 --> 00:00:17,660 even a touch screen. 3 00:00:17,660 --> 00:00:21,470 We don't tell it the actual zeros and ones it needs to understand something. 4 00:00:21,470 --> 00:00:24,110 But wait, we actually do. 5 00:00:24,110 --> 00:00:25,970 We just don't ever have to worry about it. 6 00:00:25,970 --> 00:00:30,150 We use the concept of abstraction to take a relatively complex system and 7 00:00:30,150 --> 00:00:32,290 simplify it for our use. 8 00:00:32,290 --> 00:00:35,830 You use abstraction every day in the real world, and you may not even know it. 9 00:00:35,830 --> 00:00:37,060 If you've ever driven a car, 10 00:00:37,060 --> 00:00:40,710 you don't need to know how to operate the transmission or the engine directly. 11 00:00:40,710 --> 00:00:44,230 There's a steering wheel, some pedals, maybe a gear stick. 12 00:00:44,230 --> 00:00:46,460 If you buy a car from a different manufacturer, 13 00:00:46,460 --> 00:00:49,010 you operate it in pretty much the same way 14 00:00:49,010 --> 00:00:52,370 even though the stuff under the hood might be completely different. 15 00:00:52,370 --> 00:00:54,780 This is the essence of abstraction. 16 00:00:54,780 --> 00:00:59,070 Abstraction hides complexity by providing a common interface, the steering wheel, 17 00:00:59,070 --> 00:01:01,880 pedals, gear stick, and gauges in our car example. 18 00:01:02,880 --> 00:01:04,960 The same thing happens in our computer. 19 00:01:04,960 --> 00:01:07,170 We don't need to know how works underneath the hood. 20 00:01:07,170 --> 00:01:10,442 We have a mouse and a keyboard we can use to interact with it. 21 00:01:10,442 --> 00:01:11,614 Thanks to abstractions, 22 00:01:11,614 --> 00:01:15,085 the average computer user doesn't have to worry about the technical details. 23 00:01:15,085 --> 00:01:19,030 We'll use this under the hood e metaphor throughout the program to describe 24 00:01:19,030 --> 00:01:23,530 the area that contains the underlying implementation of the technology. 25 00:01:23,530 --> 00:01:26,850 In computing, we use abstraction to make a very complex problem, 26 00:01:26,850 --> 00:01:29,900 like how to make computers work, easier to think about. 27 00:01:29,900 --> 00:01:34,010 We do that by breaking it apart into simpler ideas that describe single 28 00:01:34,010 --> 00:01:39,090 concepts or individual jobs that need to be done, and then stack them in layers. 29 00:01:39,090 --> 00:01:42,850 This concept of abstraction will be used throughout this entire course. 30 00:01:42,850 --> 00:01:45,620 It's a fundamental concept in the computing world. 31 00:01:45,620 --> 00:01:50,420 One other simple example of abstraction in an IT role that you might see a lot 32 00:01:50,420 --> 00:01:51,850 is an error message. 33 00:01:51,850 --> 00:01:55,100 We don't have to dig through someone else's code and find a bug. 34 00:01:55,100 --> 00:01:59,100 This has been abstracted out for us already in the form of an error message. 35 00:01:59,100 --> 00:02:03,670 A simple error message like file not found actually tells us a lot of information and 36 00:02:03,670 --> 00:02:06,370 saves us time to figure out a solution. 37 00:02:06,370 --> 00:02:09,400 Can you imagine if instead of abstracting an error message 38 00:02:09,400 --> 00:02:13,250 our computer did nothing and we had no clue where to start looking for answers? 39 00:02:13,250 --> 00:02:16,400 Abstraction helps us in many ways that we don't even realize. 3776

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