The Constitution of India is the supreme law of India. It is a living document, the permanent instrument which makes the government system work.[1] It lays down the framework defining fundamental political principles, establishes the structure, procedures, powers and duties of government institutions and sets out fundamental rights, directive principles and the duties of citizens. It is the longest written constitution of any sovereign country in the world.[Note 1][2] Dr. Bhimrao Ramji Ambedkar is regarded as the chief architect of the Indian Constitution, but it was the Constituent Assembly that worked under Dr Ambedkar and his team that drafted the final copy of the Indian Constitution
The constitution of India imparts constitutional supremacy and not parliamentary supremacy as it is not created by the Parliament but created by a constituent assembly and adopted by its people with a declaration in the preamble to the constitution.[3] Parliament cannot override the constitution.

The Constitution was adopted by the Constituent Assembly on 26 November 1949, and came into effect on 26 January 1950.[4] The date of 26 January was chosen to commemorate the Purna Swaraj declaration of independence of 1930.
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The preamble describes India as sovereign, secular and democratic republic.
parliamentary system : India is the biggest democratic country which is following parliamentary democratic system 
fundamental rights : every Indian has to enjoy six fundamental rights 
fundamental duties : Indian citizen should Follow THE FUNDAMENTAL DUTIES which are incorporated in the constitution of India
single citizenship : according to our constitution we have single citizenship 
federal system  : in our constitution the power distributed between center and state 
independent judiciary : in India the judiciary independently it protects the constitutional rights of the citizens 
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