Preamble to the Constitution

We the People of the United States, in order to form a more perfect Union, establish justice, ensure domestic Tranquility, provide for the common defense, 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. 

The Preamble to me, is the general outline of what the Constitution will be covering as a whole. Also, it claims that the government will help "We the People" of the United States, because we are the ones who basically run the government (we choose officials, etc.). In return America will be better living then it previously was. Overall, it was written to promote the betterment and safety of the American people.