Example Concept: Actuators for robotic legs must provide sufficient torque and speed to mimic human-like motion while maintaining energy efficiency and precision. Common types include electric motors, hydraulic actuators, and pneumatic actuators, each offering distinct advantages in terms of force output, control complexity, and integration with sensors for feedback control. The choice depends on the application, such as bipedal walking, jumping, or carrying loads, and involves balancing power-to-weight ratio, response time, and control accuracy.