Dr. Debaleena Dutta discusses communicative competence, which is the ability to communicate effectively and appropriately according to the social context. Communicative competence has four components: linguistic competence involving grammar, vocabulary, and pronunciation; discourse competence involving organizing sentences coherently; socio-linguistic competence involving adapting language style to different audiences; and strategic competence involving resolving communication breakdowns. Successful communication requires both theoretical linguistic knowledge and practical application of language according to the social situation.