Melakarta is a big group of musical scales in the Carnatic music system. In simpler words, it's like a group of different colored crayons that musicians can use to make beautiful music drawings.
Each melakarta scale has its own unique combination of notes, which are like different musical colors that the musicians can use. There are 72 different melakarta scales, and each one is named after a Hindu God or Goddess.
Just like how a teacher might write a multiplication table on the board to help kids learn math, musicians use the melakarta scales as a sort of cheat sheet to help them create beautiful music.
So, think of the melakarta like a set of special musical crayons that musicians can use to make their own beautiful songs!