The term "koltuk altı" refers to the area of the body known as the armpit. It is located beneath the shoulder joint and serves as a crucial part of the upper limb's anatomy. The armpit contains various structures, including lymph nodes, blood vessels, and sweat glands, which play important roles in the body's immune response and temperature regulation. In addition to its anatomical significance, the armpit is often associated with personal hygiene. It is a common area for the application of deodorants and antiperspirants to manage body odor and sweat. Regular grooming practices, such as shaving, are also common in this area for aesthetic reasons.