Grove is a modular electronics construction and experimentation system, produced by SeeedStudio.
Products have historically been closely associated with Arduino-compatible hardware, with base shields available for the Arduino Uno and the larger Arduino Mega formats. Compatibility with Raspberry PI+ hardware is also available from February 2015, thanks to the introduction of a Raspberry PI+ base shield.
Each Grove peripheral is connected to the base shield using a 'universal' (1-size fits all) 4-wire connector, largely avoiding the need for prototpe boards, or soldering. Connectors carry two data wires and two power wires, minimising the need for multiple connections to individual peripherals. However, the reuse of Arduino data pins on adjacent base shield connectors does require some additional care in the planning of connections used.
Details of the extensive range of Grove peripherals is available from the SeeedStudio wiki.