Adjustable pedals refer to bicycle pedals that can be adjusted in height, allowing for a more personalized fit and comfort. These types of pedals typically have an external mechanism that allows riders to change the position of the pedal body relative to the crank arm, thus altering the reach and angle at which the rider applies force to the pedals. This can be beneficial in providing a better fit for different foot sizes or shoe types, reducing strain on the knees, ankles, and lower back, as well as improving overall bike control and efficiency.