How were the words 'socialist' and 'secular' added to the Constitution?

As India looks to celebrate 76 years of the Republic, let us look at its foundation. Lately, the Constitution has been in news as political parties fight over the words used in the preamble. Just a few months ago, the words socialist and secular became a point of contentious debate. So, ahead of the 76th republic day, let us look at the history of the words socialist and secular in the constitution. Did you know that the original constitution did not feature socialist and secular in the preamble? Let’s find out why.