RASPBERRY PI PC
This is a Series of Single Board Computers/PC which was developed by the Raspberry PI Foundation. The PC can be plugged into a computer Monitor or a TV. It also Uses a Standard Keyboard, Mouse and all Computer Inputs,
The Raspberry PI is Capable to do everything a normal Desktop does. The Raspberry PI is Mostly used by Engineers and programmers
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Advantages
- Low cost (~35$)
 - Huge processing power in a compact board
 - Many interfaces (HDMI, multiple USB, Ethernet, onboard Wi-Fi and Bluetooth, many GPIOs, USB powered, etc.)
 - Supports Linux, Python (making it easy to build applications)
 - Readily available examples with community support
 - Developing such an embedded board is going to cost a lot of money and effort
 
Disadvantages
It does not replace the computer, and the processor is not as fast. It is a time consuming to download and install software i.e.; unable to do any complex multitasking. Not compatible with the other operating systems such as Windows.
Raspberry Pi models
There has generally been a Model A and a Model B of most generations. Model A has been a less expensive variant, and tends to have reduced RAM and fewer ports (such as USB and Ethernet). Here is a List of models released so far;
- Pi 1 Model B (2012)
 - Pi 1 Model A (2013)
 - Pi 1 Model B+ (2014)
 - Pi 1 Model A+ (2014)
 - Pi 2 Model B (2015)
 - Pi Zero (2015)
 - Pi 3 Model B (2016)
 - Pi Zero W (2017)
 - Pi 3 Model B+ (2018)
 - Pi 3 Model A+ (2019)
 - Pi 4 Model A (2019)
 - Pi 4 Model B (2020)
 - Pi 400 (2021)