Question

why preamble called the preface of the indian constitution

Answer 1

Preamble is an introduction of the things to come.The Preamble to our constitution summarize s it's aims and objectives.
The Preamble indicates the nature and ideal s of the state and also the ultimate source of our constitution

Answer 2

India is the largest democratic country in the world.The base of our country's democracy is our constitution which is the largest written constitution in the world.

According to the question;

Preamble of our Constitution is also known as the preface of our Constitution because preamble is the introductory statement of any documents.It describes the reason of that document.

That's why the preamble is known as the preface of our constitution.