Why are the cities of Puhar and Madurai significant in Sangam literature?

Why is the Kallanai considered significant?

Read the following excerpt and answer the questions that follow:

"Tolkappiyam, a treatise on Tamil grammar and poetics, composed probably during the second Sangam, is the oldest extant literary work in Tamil."

(Source: https://www.du.ac.in/up/oads/new-web/04012023_Appendix-108.pdf)

(a) What is the significance of the grammatical treatise Tolkappiyam?

(b) Why is Tolkappiyam important for understanding Tamil society?

What types of records were inscribed on stones and copper plates?