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What is code before we can answer that. We should answer an

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easier question. What's a computer. A computer is a clock with

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benefits. They all work the same during second grade math. One

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step at a time. Take a signal and put it in box one. Take

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another signal. Put it in the box to combine the signals and

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Box 1 and maybe add them together subtract you using a pen and

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paper can do anything. A computer could do. You just can't do

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those things. Billions of times per second that speed makes it

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possible to pull multiple sleight of hand all at once. CARD

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TRICKS ON TOP OF CARD TRICKS. Code is a means of harnessing the

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computer's power. Setting up all those card tricks. It all

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starts with words and characters entered into a computer by a

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human using a keyboard. They're writing in a programming

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language. A programming language is really just a set of rules

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. It tells you which words you can use to tell the computer what

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you needed to do. Take a look at this code 10 javascript. It's

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a very common language that turns a web page from a document

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that looks like nonsense into software. Many web pages. Amazon

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for instance are packed with software code like this. This code

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all through here code that makes the page into something dynamic

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. Now javascript is just one of thousands of languages that

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ultimately all do the same thing. They make the computer go .

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So why does it matter which you choose for the same reason that

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you don't take a bicycle to buy a fridge or get a physical from

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a neurosurgeon. Some languages just match up better with

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certain problems. C++ is something you might use if you were

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building a game for the PlayStation or x box P HP is code for

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creating millions of web pages they use it to Etsy and Facebook

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. Python's a great general purpose language. It's used by

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Instagram and a lot of scientists. So no a computer is a clock

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with benefits and we know you can use a programming language to

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make software. But how does that actually happen. Well the

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computer takes the programming code and reads through it

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character by character tosses out all the spaces tabs comments

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and other stuff it leaves behind what a computer scientists

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might call tokens. Once it has tokens the computer does the

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digital equivalent of furrowing its brow and it reorganizes

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things as necessary in a process known as compilation. Making

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the code more and more primitive until finally it's translated

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into a set of digital grunts called machine language. That's

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the sort of thing a computer can execute and those grunts have

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become just part of the furniture of your life. It's software

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that switches channels on your TV. How you can get money out of

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an A.T.M. town elevator takes you have five flights of stairs .

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You write code and the computer turns it into software and that

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can run as many times as you need omnipresent familiar invisible

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. That is the story of code .