Question

difference between Arduino and Raspberry pi?

Answer 1

Arduino:A Open programmable Usb microController, its can execute only one program at a time.

Raspberry pi: A credit card sized computer, we can run multiple program at a time and  its have more computing power compared to arduino

Answer 2

The differences between Arduino and Raspberry Pi are: 

Arduino	Raspberry Pi
Arduino is a microcontroller board.	Raspberry Pi is a microprocessor-based mini computer (SBC).
CPU architecture: 8 bit	CPU architecture: 64 bit
It has 2kB (Kilobytes) of RAM	It has 1GB of RAM
Arduino is very easy to use	It is more complicated to use than an Arduino.
Arduino can be programmed using C or C++ programming languages.	Python, Scratch, Ruby, C, C++ can be used for developing applications.
It is used for running a single task repeatedly.	It can perform multiple tasks simultaneously