The terms "e-collar" and "shock collar" are sometimes used interchangeably, but they have slightly different meanings. "E-collar" is a broader term that encompasses various electronic collars used for dog training, including those that utilize different types of stimulation such as vibration, sound, and electric shocks. On the other hand, "shock collar" refers explicitly to electronic collars that deliver electric shock collars as a corrective or aversive stimulus. These dog collars allow the intensity of the shock to be adjusted, providing a range of levels.