A piano frame, also known as the piano case or piano structure, is the sturdy outer shell that supports the internal components of a piano. It is typically made from wood or metal and is designed to withstand the immense tension created by the piano strings. This frame helps maintain the instrument's shape and contributes to its overall sound quality. Inside the piano frame, you'll find essential parts like the soundboard, strings, and action mechanism. The frame plays a crucial role in ensuring that these components work together harmoniously, allowing the piano to produce a rich and resonant sound when played.