Contact tracing is a way of tracking who might have been exposed to an illness. When someone gets a disease, contact tracing helps doctors trace who this person may have been in contact with and make sure they don't get sick too. It works like this: when someone contacts a hospital or doctor with a disease, the hospital or doctor will ask them to list all the people they have seen or been in close contact with in the last few days. Then, the doctors or health officials will contact those people to let them know they may have been exposed to the illness. They'll also recommend ways for those people to prevent getting sick, like staying home, washing their hands often, or getting tested for the illness. Contact tracing is an important part of fighting the spread of disease and making sure everyone stays healthy!