Kolezhuthu is a kind of writing that was used in India a long, long time ago. It's a bit like how we write words with our pens or pencils today, but instead of using those things, people used sharp metal tools to make marks on palm leaves or parchment paper.
Kolezhuthu letters look different than the letters we use in English. They are more like little pictures – some look like sticks, some look like squares or triangles, and some even look like little animals. These letters were very important in ancient India because they were used to write down important things like religious texts or historical stories.
Nowadays, people in India still appreciate the beauty of the Kolezhuthu letters, but they don't use them as much for writing. Instead, they are used in things like artwork or decorations for special occasions like weddings.
So, in summary, Kolezhuthu is a really old way of writing that people in India used to use a lot, and even though it's not used as much for writing anymore, it's still an important part of Indian culture!