An emergency is one such provision in the Indian constitution, which is used when the country is in danger of any internal, external or financial threat. 

The framers of the Constitution had envisioned a state of emergency keep in mind the times in which the unity, integrity and security of the country are at risk. Keeping this in mind, some such provisions were made under which the central government could take serious decisions without any restriction. 

For example, if a neighboring country attacks us, then our government should not pass any kind of bill in Parliament for retaliation. Since there is a parliamentary democracy in our country, our country has to first pass a bill in Parliament to fight any country.

Since the independence of India, the state of emergency has been declared three times. The first example was during the Indo-China War between 26 October 1962 to 10 January 1968, when India's security was declared a threat from external aggression due to China,. 

The second instance came between 3 December 1971 to 21 March 1972, which was originally proclaimed during the Indo-Pakistan war. It was later extended along with the third proclamation between 25 June 1975 to 21 March 1977 under controversial circumstances of political instability under Indira Gandhi's prime ministership, when the emergency was declared on the basis of "internal disturbance",  but the term was very Was ambiguous and had a broader meaning and hence the 44th Amendment Act 1978 substituted the words "internal disturbances" for "armed rebellion".