Kālidāsa is one of the greatest poets and playwrights in classical Sanskrit. His main contributions are:

Meghadūtam (The Cloud Messenger): A lyric poem in which a separated lover sends a message via a cloud; noted for its vivid imagery and emotional depth.

Shakuntala: A celebrated play about love and destiny that influenced later drama and literature.

Vikramorvasiyam: A drama combining romance and mythological themes, showing his skill in characterisation and language.

Kālidāsa's language, imagery and depiction of human emotions set a high standard for later Sanskrit literature.