* Drive Gear: This is the gear that *initiates* the motion. It's connected to a power source (like a motor or engine) and its rotation causes the driven gear to turn. Think of it as the "leader" in the gear train.
* Driven Gear: This gear *receives* motion from the drive gear. It's the one that's turned *by* the drive gear. It's the "follower" in the gear train.
In short: The drive gear *provides* the power, and the driven gear *receives* the power. This power transfer can change speed and torque depending on the gear ratios.
