We can usually easily recognize the faces of people we know well, even under difficult conditions (e.g. from images with poor resolution). The situation is quite different when we have to memorize new faces. Recognizing such faces is very error-prone, even under optimal conditions. This is a serious problem when evaluating eyewitness testimony, for example, which regularly leads to serious miscarriages of justice.
In addition, the ability to learn and recognize faces varies considerably across the population. While some people even have difficulty recognizing family members, there are some who virtually never forget a face. Most people do not have a clear idea of how good their ability to recognize faces is. Are you perhaps a "super recognizer"? You can test this with us. You can also find out about other exciting aspects of face recognition.