A house call is when a doctor or medical professional comes to your home to check on how you are feeling and help you feel better. It's like having the doctor come to you instead of you having to go to the doctor's office.
Just like when you go to the doctor's office, the doctor will ask you questions about how you are feeling, and they may use special tools like a stethoscope to listen to your heartbeat or a flashlight to look in your ears. They may also give you medicine that can help you feel better.
House calls used to be very common a long time ago, but now they are not used as much because many people go to the doctor's office or hospital instead. But sometimes, house calls can be helpful, especially if you are too sick or hurt to leave your home.