What is the difference between atrial flutter and atrial fibrillation?

The frequency of atrial flutter attack is relatively small, the time is relatively short, its condition is mild, the patient can recover by himself, the harm to the body is also small, the frequency of atrial fibrillation attack is relatively high, the time is relatively long, the condition is serious, it may damage the normal function of the body, and antiarrhythmic drugs need to be used according to the doctor's advice.