Flexible joints are specialized connections in the body that allow for movement and flexibility. They are found in various parts of the body, such as the knees, elbows, and shoulders. These joints are designed to absorb shock and reduce friction, enabling smooth motion during activities like walking, running, and lifting. In addition to human anatomy, flexible joints can also refer to mechanical components in machines. These joints help absorb vibrations and accommodate misalignments, ensuring that machinery operates efficiently. Examples include couplings in engines and hinges in doors, which allow for movement while maintaining structural integrity.