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