Atc codes are like labels for medicines. They are used to identify what type of medicine a doctor is prescribing for you. The atc code is made up of four or five letters and numbers. For example, 'B01AE08' is the atc code for an aspirin. The 'B' at the beginning stands for "blood and blood forming organs". The first two numbers (01) represent the type of medicine, which in this case is antiplatelet agents. The 'AE' stands for "non-steroidal anti-inflammatory drugs (NSAIDs)". The last two digits (08) are the exact type of medicine, which is aspirin. So, Atc codes help doctors quickly identify the right medicine for a patient and make sure the patient gets the most effective and safe treatment.