All The Bytes

Byte

A byte is a unit of data which is 8 binary digits long.
a byte is what most computers use to represent a character
such as a letter.

Nibble

A nibble is half of a byte, this means it is 4 bits instead of 8.

 Bit

A bit is the smallest unit of memory on the computer, it
is 1 bit.

Keyword		Description
	byte	Bytes
kb	kilobyte	Kilobyte = 1,000 bytes
mb	megabyte	Megabyte = 1,000,000 bytes
gb	gigabyte	Gigabyte = 1,000,000,000 bytes
tb	terabyte	Terabyte = 1,000,000,000,000 bytes
pb	petabyte	Petabyte = 1,000,000,000,000,000 bytes
eb	Exabyte	Exabyte = 1,000,000,000,000,000,000 bytes

Ram & Rom

                                                                      RAM & ROM Table

	RAM	ROM
Definition:	Random Access Memory or RAM is a form of data storage that can be accessed randomly at any time, in any order and from any physical location., allowing quick access and manipulation.	Read-only memory or ROM is also a form of data storage that can not be easily altered or reprogrammed. Stores instructions that are not necessary for re-booting up to make the computer operate when it is switched off. They are hardwired.
Stands for:	Random Access Memory	Read-only memory
Use:	RAM allows the computer to read data quickly to run applications. It allows reading and writing.	ROM stores the program required to initially boot the computer. It only allows reading.
Volatility:	RAM is volatile i.e. its contents are lost when the device is powered off.	It is non-volatile i.e. its contents are retained even when the device is powered off.
Types:	The two main types of RAM are static RAM and dynamic RAM.	The types of ROM include PROM, EPROM and EEPROM.

Representation of Images

                                                              Representation Of Images




     This simple  image based on the sort of graphics in the Space Invaders video game can be represented   in just eight bytes by representing each row with a byte with  white as 0 and black as 1.
In reality images are much more complex than this simple small drawing has 100x123 pixels and dots

representing data

You can make pictures by using binary. the 0 and 1 tell the computer what colour it should make the pixels. Also that you can turn sound into binary and hex, however it takes a lot more data to represent sound than numbers.