1. The document examines changes in Tamil cinema over the last 100 years and analyzes Tamil films that have been commercially successful and reflected social themes. 2. It discusses several influential early Tamil films like Nallathambi, Parasakthi, and Manthirikumari that promoted social equality and Dravidian ideals. 3. More recently, Tamil films like Merkku Thodarchi Malai, Asuran, Jay Beam, Indian, Anniyan, and others addressed issues like communism, social justice, corruption, education, and women's rights.