Cardiac arrest is today's biggest public health problem and the most common cause of death, and above all, it requires quick recognition and emergency CPR combined with defibrillation in order to preserve the health of the injured person. In cardiac arrest, the function of the heart is interrupted and there is no pulse and breathing. In a cardiac arrest situation, the most important thing is to ensure the return of circulation and the best possible tissue oxygenation [1]. Procedures that are performed when meeting an injured person are divided into two groups, and the main difference between them is who performs these procedures. Basic maintenance refers to procedures that are carried out in situations of lack of adequate equipment and can be carried out by a layman, while advanced maintenance is exclusively the domain of professional medical personnel with various medical aids [2]. In order to increase the chances of survival after cardiac arrest, the European Council for Resuscitation has recommended a series of procedures that improve the chance of survival, called the "chain of survival". The chain of survival consists of early recognition of arrest, quick response , basic life support and early defibrillation [10]. When meeting with an injured person, it is important to determine the safety of the environment. This is followed by a quick check of pulse, breathing, state of consciousness and bleeding, and early initiation of cardiopulmonary resuscitation. CPR is started with chest compressions at a frequency of 100-120 compressions per minute with pressure to a depth of about 5 cm. Compressions are followed by 2 breaths with vital signs checked every 2 minutes [11]. One of the key aspects in the CPR process in out-of-hospital conditions is the use of an AED device, which enables a quick and correct assessment of pathological heart rhythms and, if necessary, delivers the necessary amount of electrical energy to re-establish a proper rhythm, thus increasing the chance of survival by 2-3 times . The AED device is easily portable, easy to use and gives precise instructions to the rescuer in order to preserve the life of the victim until help arrives [23]. This research examined the level of knowledge of students about resuscitation and first aid according to the field of study with the aim of determining the differences in the level of knowledge according to the way in which this knowledge was acquired.