Whole foods are foods that don’t purposely have any nutrients removed although some can be lost through processing such as cooking, drying, blending or shredding. Some examples are: boiled brown rice, apples, whole or shredded carrots, baked potatoes. Another example is whole wheat flour: it is made of whole grains that have undergone a grinding process. It is whole but processed food.
Note: the amount of some nutrients may decrease during processing, through heat or oxidisation. For instance, cooked carrots may lose some vitamins in the process of heating but they are still whole food since the amount of nutrients removed do not alter the product.