Pickled olives are a food product composed of mature olives that have undergone a process of preservation in brine, a solution of water and salt. This method of preservation gives the olives a salty flavor and extends their shelf life. Pickled olives are a very versatile ingredient in the kitchen. They can be used as an appetizer, salad dressing or ingredients for main dishes. They can be added to salads, pizzas, sandwiches or meat or fish recipes for a salty taste and a touch of acidity.