NDD (No Dealing Desk) execution utilizes what is referred to as agency execution or an agency model. Whenever a trader places a trade, the order is sent to the broker and the broker immediately offsets the trade 1-for-1 with one of several liquidity providers.
As a result, the broker does not profit if the trader loses and does not lose if the trader profits. Instead, the broker is compensated by a
pip mark-up added to the spread or by charging a separate commission. NDD is sometimes also referred to as STP (Straight Through Processing) or DMA (Direct Market Access).
STP (Straight-through processing) and
DMA (Direct Market Access) redirect here.
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Forex 
