What is the reason and idea for the mitzvot of Purim, especially the reading of the Megillah every year?

I wanted to ask, what is the idea that underlies the regulation for generations that our Sages established for us to read the Megillah every year? There is certainly some rationale for this, that they wanted us to internalize the story of the Megillah that concerns generations, including you and I in 2023, and I asked in my request what that idea, or view they wanted us to internalize, and what, then, are the practical implications of this for our implementation?