Because most of the equipment found in a shop has sharp blades moving at high speeds, the potential for severe injuries is high.
For this reason an essential part of most pieces of equipment in a shop are the machine guards.
Modern guards provide protection without interfering with the tool's ability to do the job you want it to do.
Properly functioning guards provide a barrier between the person operating the tool and the fast moving blades. They also help contain sawdust, wood chips and other debris that can be thrown towards the person operating the equipment.
Machine guards by themselves can’t protect you. In order for them to work properly requires that you
set up and use the equipment in a safe manner.