Remoulade is referring to a classic French sauce made by combining mayonnaise with mustard, capers and chopped gherkins, herbs and anchovies. It's served chilled as an accompaniment to cold meat, fish and shellfish.
Remoulade is a popular condiment in many countries, and was invented in France. Very much like the tartar sauce of some English-speaking cultures, remoulade is often mayonnaise-based.
It is a classic French sauce made from mayonnaise which is generally homemade, mustard, capers, chopped gherkins, anchovies, and herbs. A remoulade is served cold, as a condiment or dressing with cold meat, fish and shellfish.