The three types of emergencies are: 1. National Emergency (Article 352): Can be proclaimed by the President on the grounds of war, external aggression, or armed rebellion. 2. State Emergency (President's Rule) (Article 356): Can be imposed by the President if the constitutional machinery in a state breaks down. This is also referred to as constitutional emergency. 3. Financial Emergency (Article 360): Can be proclaimed by the President if the financial stability or credit of India is threatened.