Question

what is preamble? And what it contains?

Answer 1

The 'Preamble' of the Constitution of India is a brief introductory statement that sets out the guiding purpose and principles of the document, and it indicates the source from which the document derives its authority, meaning, the people.[1] The hopes and aspirations of the people as well as the ideals before our nation are described in the preamble in clear words. It may be considered as the soul of Constitution. The preamble can be referred to as the preface which highlights the entire Constitution. It was adopted on 26 November 1949 by the Constituent Assembly and came into effect on 26th January, 1950.
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Answer 2

a preamble is a signal used in network communication to synchronize transmission timing between two or more system .In general preamble is a synonyms for introduction ."... proper timing is required to ensurethat all system are interpreting the start of the information transfer correctly.