Pickle refers to vegetables or fruit, sometimes cut into pieces, which have been kept in vinegar or salt water for a long time so that they have a strong, sharp taste. Chutney, on the other hand, is a spicy condiment of Indian origin, made of fruits or vegetables with vinegar, spices, and sugar.
In cooking, a sauce is a liquid, cream, or semi-solid food, served on or used in preparing other foods. Most sauces are not normally consumed by themselves; they add flavor, moisture, and visual appeal to a dish.