Microprocessor Systems Engineering

Applications of Pulse Width Modulation
Conduct research into applications of pulse width modulation (PWM).  Include proper APA citation for all sources referenced.

Include the following:

An explanation of how pulse width modulation allows analog results via digital control.
Applications and uses of PWM in Arduino based systems
Examples of the various methods to achieve PWM with the Arduino. 
How PWM is implemented with another processor such as the Intel i7.