What is Arduino?
Officially, the Arduino is an open-source electronics prototyping platform. And, technically, it is a programmable logic controller. The Arduino is like a little computer you can program to do things, and it interacts with the world through electronic sensors, lights, and motors.
Please refer to the video clip below and visit arduino.cc for more detail.
Products in LurnBot.com support Arduino in different ways: some (e.g. Rokit Smart) use Arduino IDE (Integrated Development Environment) -you need to download IDE- for programming and some (e.g. Makeblock DIY Starter Kit) use its own app integrated with Arduino for programming - you don't need to download IDE.