The term "hallux" refers to the big toe in humans and many animals. It plays a crucial role in balance and walking, providing support and stability during movement. The hallux is typically the largest toe and is located at the front of the foot, opposite the heel. In medical contexts, issues related to the hallux can include conditions like hallux valgus, commonly known as a bunion, where the big toe deviates towards the other toes. Proper care and footwear are essential for maintaining the health of the hallux and preventing discomfort or injury.