Kale salad refers to a dish made with kale, which is a leafy green vegetable. The kale leaves are typically blanched or massaged and then combined with other ingredients such as nuts, seeds, fruits, and dressings to create a flavorful and nutritious salad. Kale has become popular in recent years due to its high nutritional value, including its rich content of vitamins A, C, and K, as well as its antioxidant properties.