Qwiic and Grove are the standardized I2C interface used to connect sensors and devices to a development board. The reason why Grove and Qwiic exist is to make it quick and very easy to connect I2C devices to your development board. What differentiates Grove and Qwiic is that they have physically different 4-pin connectors. There are adapter cables between Qwiic and Grove if you want to mix devices with different connectors. It is possible to connect I2C devices in a chain one after another. This is why both Grove and Qwiic devices/sensors often have two connectors. Qwiic uses the JST-SH 4-pin connector. Qwiic color coding: Black - GND. Red - 3.3V. Blue - SDA. Yellow - SCL.
Arduino, Adafruit and Sparkfun use the Qwiic variant. Adafruit refers to Qwiic as Stemma QT
Cytron and Seeed use the Groove variant
Note that Adafruit has two variants of Qwiic:
STEMMA, with 4-pin JST-PH connector (used previously)
STEMMA QT, with 4-pin JST-SH connector (fully compatible with Qwiic)
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