The armpit, also known as the axilla, is the area under the joint where your arm connects to your body. It is a small, often overlooked part of our anatomy, but it plays a significant role in our daily lives. The skin in this area is sensitive and contains many sweat glands, which help regulate body temperature by producing sweat. In addition to sweat glands, the armpit is home to lymph nodes, which are part of the immune system. These lymph nodes help filter out harmful substances and fight infections. Keeping the armpit clean and well-groomed is important for hygiene and comfort.