An otoscope is a handheld tool used to examine the ear canal and eardrum, which can be used at home to monitor ear health, identify issues like wax buildup or infections, and aid in telemedicine. It works by using a light and magnifying lens to provide a clear view inside the ear, and with modern versions, it can capture photos or videos to share with a medical professional for further guidance. Home use should be done with caution, and it is crucial to be gentle, move slowly, and stop immediately if any pain occurs.