SMALLEST COMPUTER IN THE WORLD

it named as RESP BERRY PI

OPERATES ON RESBIAN OPERATING SYSTEM

AND IT IS AALS KNOWED BY 

ATM CARD SIZE COMPUTER

BUY IT FROM AMAZON 

AT CLICK ON BELOW LINK

https://www.amazon.in/Raspberry-Pi-Model-Motherboard-NEW-LAUNCH/dp/B07BHP46Y6/ref=sr_1_4?crid=2RTBLIJAEK02B&keywords=raspberry+pi+3+b%2B&qid=1563457656&s=gateway&sprefix=RESPBERRY%2Caps%2C483&sr=8-4