Top notes, also known as head notes, are the initial scents that you perceive when you first apply a fragrance. They are typically light and volatile, evaporating quickly within the first 5 to 15 minutes. Common top notes include citrus scents like lemon and bergamot, as well as fresh herbs like mint. These notes play a crucial role in creating the first impression of a fragrance. They set the stage for the deeper, more complex scents that follow, known as middle or heart notes. Understanding top notes helps in selecting perfumes that align with personal preferences and occasions.