What is Binary?

- Binary is nothing more than a
*System of Counting* - Everything in a computer’s brain comes down 0’s & 1’s
- Binary existed before computers
- Binary is an
*ON*or*OFF*counting system, all or nothing. ‘1’ represents*ON*, ‘0’ represents*OFF*. - Because each digit in binary can have 2 values, the base is 2 (see the example below for clarification)

Don’t worry if it doesn’t make sense yet…

Let’s look at an example to clarify this..

- Below is an 8 digit binary number
- We calculate binary from right to left

3. Because it’s a base 2 system, each digit is 2 to the power of (n). (n) refers to the placement of the number.

4. A binary number is pretty much telling us whether or not we are using that value

5. The 1 value tells us we are using that value (represented by green checkmarks) & the 0 value tell us we are not using that value (represented by red X’s).

6. The first digit in this example is representing that the value 2 to the power of 0 is *ON*

7. The second digit (2 to the power of 1) is *OFF *so the value is 0.

Let’s represent those 2 values in our drawing..

Let’s calculate the rest of the values & add the ones that are ON together…

What we just did can be represented in the following equation:

If Binary is just a counting system, what do people mean when they want to write something in Binary?

- What they mean is how to spell things with
**ASCII (American Standard Code for Information Interchange)** -
**ASCII**is a way to convert a computer’s data (which can only be in numbers) & turn it in to letters. - ASCII chart assigns a character to each value represented by a byte (8 bits/digits) of binary.

Let’s take a look at our previous example..

- This example represents
**Uppercase Y** - Since 8 digits of binary can represent up to 255 values, the ASCII chart has 255 letters & symbols to choose from.

Let’s try another example:

Now that we deciphered the two letters above let’s take a look at the following example & read what it says:

**01011001 01101111 01101100 01101111**

Let’s evaluate….

Since we already looked at the breakdown for some of these binary letters, we only have one 8 digit binary letter left — the third one, which comes out to a lowercase l.

If you read the word it spells out…

”Yolo”

Hope this helped you learn how to read binary :) Happy Coding!

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