Basil leaves are small, aromatic, and vibrant green in color. They have an oval or lance-shaped structure with smooth edges. The leaves grow opposite each other on the stem and are typically 2 to 3 inches in length. Basil leaves have a soft, velvety texture and emit a distinct sweet, spicy, and slightly peppery fragrance. They are commonly used as a culinary herb due to their strong flavor and aroma.