Final answer:
The most important detail to include in a summary about the charango is that it is a small stringed instrument that originated in 18th-century Peru.
Step-by-step explanation:
The charango is a unique stringed instrument with a rich history and a distinctive sound. Originating in 18th-century Peru, this instrument is known for its small size and the fuller sound it produces compared to similar instruments like the ukulele, because of its 10 strings. The charango was traditionally made from armadillo shells, but today it is usually crafted from wood. It is primarily played in South American countries such as Peru, Argentina, and Bolivia, showcasing its significance in the region's musical culture.