In short
An AMR is a mobile robot that uses maps and sensors to plan its own route through a facility and move materials without fixed tracks or markers.
Classic AGVs follow fixed paths, while AMRs detect obstacles and drive around them. Warehouse-to-line supply, WIP transport and end-of-line unloading are typical tasks.
With several AMRs, tasks, charging times and traffic priority need to be orchestrated by fleet management software.