• The physical, tangible parts of a computer
• keyboard, monitor, disks, wires, chips, etc

• Programs and data

A series of instructions

• A computer requires both hardware and software
• Each is essentially useless without the other

Devices used to input data or information

• Mouse
• Keyboard
• Remote Control

Devices that display data or information

• Computer Screen
• Headphones
• Speakers

Provide long-term storage

• Information is moved between main and secondary memory as needed
• Without Second Memory, all information would be lost (as RAM can only store active data)

• Controls all machine activities
• Provides the user interface tothe computer
• Manages resources such as the CPU and memory
• Windows, Mac OS, Unix, Linux

The information is broken down into pieces, and represent separately

• Modern computers are digital

How many unique items can be represented using:

• 1 bit 
• 2 bits 
• 3 bits

• 1 bit = 2 unique items
• 2 bits = 4 unique items
• 3 bits = 8 unique items

How many bytes are in a:

• Kilobyte?
• Megabyte?
• Gigabyte?

• Kilobyte = 1024 bytes
• Megabyte = 1,048,576
• Gigabyte = 1,073,741,824

Order from least to greatest:

Megabyte, Kilobyte, Terabyte, Gigabyte