Crutches are mobility aids designed to support individuals who have difficulty walking due to injury, illness, or disability. They come in various types, including underarm crutches, forearm crutches, and platform crutches, each catering to different needs. Underarm crutches are the most commonly used and provide support under the armpits. Forearm crutches, on the other hand, allow for a more natural walking motion and are ideal for individuals who require ongoing support but still want to maintain a level of independence.