What does D3 and D4 mean for an Auto. Transmission on a 2000 Honda Civic?

What does D3 and D4 mean for an Auto. Transmission on a 2000 Honda Civic?

Drive 3 or 3rd gear, drive 4 or overdrive. Set it on D4 and forget it.

Ron nailed it.

Not hardly, d 3 and d4 will shift up and down, other selections will not, they stay in that gear. Other than that ron is right