Which programing languages are used to program a arduino ?

Answer 1

Arduino consists of both a physical programmable circuit board (often referred to as a microcontroller) and a piece of software, or IDE (Integrated Development Environment) that runs on your computer, used to write and upload computer code to the physical board.
the Arduino language is merely a set of C/C++ functions that can be called from your code
https://www.arduino.cc/en/Main/FAQ

Answer 2

If you Google that, after a bit of searching you'll figure out that you may also use Python, Golang, Java and even JS for tha task, but I would stick to the C like Arduino language

Answer 3

C++