What does it mean to say fruit and vegetables were pickled?

Pickling is the process of preserving food in an acidic solution, typically vinegar, along with other ingredients such as water, sugar, salt, and spices. The acidity of the vinegar prevents bacteria from growing and spoiling the food, while the other ingredients add flavor and complexity to the final product. Pickled fruits and vegetables have a long shelf life and can be stored at room temperature. They are often used as condiments or side dishes, and can also be incorporated into other recipes, such as salads and sandwiches.