Collaborative robots are robots designed to interact with humans in a shared space or work safely in close proximity. In contrast, traditional industrial robots are designed to work autonomously and safely through contact precaution with human. The safety of cobots may depend on lightweight structural materials, rounded edges, and speed or force limitations. Safety may also require sensors and software to ensure good collaborative behavior. Collaborative service robots can perform a variety of functions, including information robots in public places; logistics robots that transport materials in buildings; and inspection robots equipped with cameras and visual processing technologies. These robots can be used in a variety of applications, such as patrolling the perimeters of security facilities. Collaborative industrial robots can be used to automate repetitive and ergonomically unfavorable tasks,  such as picking and placing heavy parts, machine feeding, and final assembly.