This review article discusses the development and challenges of untethered soft actuators for soft robotics. Soft actuators are essential for enabling functional movements in soft robots, but traditional actuators often rely on electrical wires or pneumatic tubes, limiting their practical applications. The article reviews recent advancements in untethered soft actuators, which do not require external wiring, and discusses their potential for future soft robotics. Soft robots are composed of materials that mimic biological tissues, such as elastomers or hydrogels, allowing them to deform and interact safely with humans. However, they face challenges such as weak actuation force and slow mobility. Recent innovations have addressed these issues by using materials with variable stiffness, phase change materials, and external stimuli like magnetic fields, heat, electricity, light, and humidity to power soft actuators without external wiring. The article categorizes untethered soft actuators into four types: pneumatically/hydraulically-driven, magnetically-driven, heat-driven, and electrically-driven. Each type has its own strengths and limitations. For example, pneumatically-driven actuators use phase change materials to generate mechanical force without external pumps, while magnetically-driven actuators use magnetic fields for remote control. Heat-driven actuators convert thermal energy into mechanical work, and electrically-driven actuators use electrical inputs to generate mechanical deformation. The review highlights the potential of these actuators in various applications, including soft grippers, haptic devices, and bio-inspired robots. However, challenges remain, such as the need for precise force output, material durability, and energy efficiency. The article also discusses the importance of developing standardized practices and collaborations among researchers and industry to advance soft robotics. In conclusion, untethered soft actuators represent a significant breakthrough in soft robotics, offering the potential for greater mobility, versatility, and functionality. However, further research is needed to overcome existing challenges and fully realize the potential of these actuators in practical applications.This review article discusses the development and challenges of untethered soft actuators for soft robotics. Soft actuators are essential for enabling functional movements in soft robots, but traditional actuators often rely on electrical wires or pneumatic tubes, limiting their practical applications. The article reviews recent advancements in untethered soft actuators, which do not require external wiring, and discusses their potential for future soft robotics. Soft robots are composed of materials that mimic biological tissues, such as elastomers or hydrogels, allowing them to deform and interact safely with humans. However, they face challenges such as weak actuation force and slow mobility. Recent innovations have addressed these issues by using materials with variable stiffness, phase change materials, and external stimuli like magnetic fields, heat, electricity, light, and humidity to power soft actuators without external wiring. The article categorizes untethered soft actuators into four types: pneumatically/hydraulically-driven, magnetically-driven, heat-driven, and electrically-driven. Each type has its own strengths and limitations. For example, pneumatically-driven actuators use phase change materials to generate mechanical force without external pumps, while magnetically-driven actuators use magnetic fields for remote control. Heat-driven actuators convert thermal energy into mechanical work, and electrically-driven actuators use electrical inputs to generate mechanical deformation. The review highlights the potential of these actuators in various applications, including soft grippers, haptic devices, and bio-inspired robots. However, challenges remain, such as the need for precise force output, material durability, and energy efficiency. The article also discusses the importance of developing standardized practices and collaborations among researchers and industry to advance soft robotics. In conclusion, untethered soft actuators represent a significant breakthrough in soft robotics, offering the potential for greater mobility, versatility, and functionality. However, further research is needed to overcome existing challenges and fully realize the potential of these actuators in practical applications.