When you draw diodes, the symbol clearly indicates the direction of forward current flow. You don’t really need names for the two terminals, but if you want to know, they are the Anode and Cathode.
This forward-bias voltage drop exhibited by the diode is due to the action of the depletion region formed by the P-N junction under the influence of an applied voltage. If no voltage applied is across a semiconductor diode, a thin depletion region exists around the region of the P-N junction, preventing current flow.
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