The preamble is the introduction to the Constitution. It outlines the general goals of the framers: to create a just government and to ensure peace, an adequate national defence and a healthy, free nation. With its first three words, "We the People," the preamble emphasizes that the nation is to be ruled by the people - not a king or a dictator, not the president, Supreme Court justices, members of Congress or state legislators.
The preamble is not a source of federal power or individuals' rights. Rather, all rights and powers are set out in the articles and amendments that follow.
The American constitution was the first to begin with a Preamble. Many countries including the India followed this practice. The term Preamble refers to introduction or preface to Constitution.
The Preamble of the Indian constitution was taken from the United States of America.
Preamble of the United States of America :
We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.