How soft robots are learning to move like living creatures

Robots used to be rigid machines confined to factory floors, built from metal, gears and bolts. A newer generation looks very different: they bend, stretch and squish, and some resemble worms, octopus arms or inflatable toys.

This emerging field, known as soft robotics, is reshaping how engineers think about movement, safety and interaction with everyday environments. It connects biology, materials science and engineering, and could quietly influence many tools people use at home, in hospitals and in industry.

What makes a robot “soft”

Soft robots are built from deformable materials such as silicone rubbers, flexible plastics, textiles, or even gels and fluids. Instead of rotating joints and hard links, their structure can twist and fold continuously, a bit like muscle or skin.

To create motion, soft robots often use air pressure, fluids, heat, light or electric fields. Inflating a chamber can bend a limb, while changing temperature can contract an artificial muscle. The key feature is compliance: the robot can give way when it meets an obstacle, rather than fighting against it.

Inspired by animals without bones

Many designs borrow ideas from biology, especially creatures that move without skeletons. Octopus arms, starfish legs, caterpillars and earthworms all manage complex tasks with flexible bodies. They squeeze into tight gaps, grip irregular objects and adapt automatically to their surroundings.

Engineers study these animals to understand how their muscle patterns and tissue structures generate motion. For example, a common design for a soft robotic gripper uses several finger-like tubes that curl when pressurized, wrapping gently around objects of different shapes without needing precise finger placement.

Why softness matters for safety and adaptability

Traditional robots are powerful but can be dangerous if they collide with a person. Soft robots, by contrast, absorb impacts through their structure. This makes them attractive for tasks that involve close contact with humans, fragile items or uncertain environments.

A soft arm working alongside a worker can brush against them without causing harm. A flexible gripper can pick up fruit, glassware or electronic components without crushing them, reducing the need for complex sensing and control. The material itself becomes part of the safety system.

Inside the “muscles” of soft robots

Soft actuators, which function like muscles, come in several main types. Pneumatic actuators use air pressure in chambers shaped to bend or twist when filled. Hydraulic versions use liquids instead of air, which can offer finer control but require careful sealing.

Another class relies on smart materials. Shape memory alloys change shape with temperature. Dielectric elastomers deform under electric voltage. Fluidic elastomer actuators combine stretchy polymers with internal channels for air or liquid. Each approach balances speed, force, efficiency and durability in different ways.

Challenges: control, power and durability

Soft robots are not simply softer versions of existing machines. Their flexibility makes them hard to model mathematically, because nearly every part of the body can bend in many directions at once. This complicates control, especially when tasks require precision.

Power and integration are also difficult. Pumps, valves and batteries are often rigid and bulky, so researchers are exploring compact systems and embedded channels within the soft structure. Durability is another issue, since flexible polymers can tear or wear over time, especially in harsh or outdoor conditions.

Everyday and industrial applications

Despite these challenges, soft robotics is already finding practical uses. In agriculture, gentle grippers handle fruits and vegetables of different sizes on packing lines. In manufacturing, compliant end-effectors adapt to new parts without reprogramming every tiny adjustment.

Wearable soft exosuits are being developed to assist walking or lifting, using textiles and inflatable components that sit close to the body. These supports aim to reduce strain for workers or help people with impaired mobility, while staying lighter and more comfortable than traditional powered exoskeletons.

Healthcare and exploration possibilities

In healthcare settings, flexible robotic tools can navigate delicate environments. Researchers have demonstrated soft catheters and tentacle-like devices that can move through passages with reduced risk of damaging tissue, guided by imaging systems and sensors.

Soft robots also show promise in exploration. Their ability to squeeze through cracks, absorb impacts and operate in cluttered spaces makes them potential candidates for search and rescue in collapsed buildings or for inspecting pipes, machinery or underwater structures that are hard to access.

How AI and sensing help soft bodies act intelligently

Because soft robots are hard to model precisely, data-driven methods are becoming important. Machine learning can help discover control patterns that produce reliable movements, even when the underlying physics is complex.

At the same time, researchers are embedding sensors directly into flexible materials, such as stretchable strain gauges or soft optical fibers. These allow the robot to feel its own shape and the forces it experiences, which is crucial for safe gripping, walking on uneven ground or adapting to unexpected contact.

From labs to daily life

Most soft robots today are prototypes or specialized tools, but the underlying ideas are filtering into everyday devices. Flexible wearables, adaptive cushions, smart textiles and safer gripping systems draw on similar principles of compliance and distributed actuation.

As materials improve and control methods mature, it is likely that many people will interact with soft robotic systems without labeling them as robots at all. They may simply experience tools that are more forgiving, more comfortable and better suited to the irregular, unpredictable shapes of real life.