Dynamic drifting is accel-off technique for initiating the drift. That is, the idea is to enter the corner at full throttle or at least with some good acceleration, and then immediately let off the throttle completely while transfering weight to the outside. The sudden change in acceleration will transfer the weight of the car from the rear to the front (similar to the way feint transfers from side to side), putting the rear wheels at a temporary loss of traction. "Temporary" is key here so you must transfer the weight to the outside of the corner during this window of opportunity or you will have to revert to a brake or e-brake drift.
P.S. - Dynamic drifting is practically the only way to link corners, it's by far the easiest and most common except in scenarios where the second corner is tighter than the first. For initiating the first drift though, it's much harder to use accel-off.