The Natyashastra, attributed to the sage Bharata, is an ancient Sanskrit text that deals with the theory of dramaturgy and performance. It is considered the foundational text for Indian literary theory and aesthetics.

Rasa, or aesthetic experience, is the central concept in Bharata's theory of drama. It refers to the emotional response evoked in the audience through the performance of a play.

Anandavardhana, in his work 'Dhvanyaloka', introduced the concept of 'Vakrokti' or oblique expression. He argued that the true meaning of a literary text lies not in its literal sense but in its suggested or implied meaning.

Abhinavagupta, in his work 'Abhinavabharati', elaborated on Bharata's theory of rasa. He emphasized the importance of the audience's emotional response and the role of the actor in conveying the rasa.

Vamana, in his work 'Kavyalankara', discussed the concept of 'Riti' or poetic style. He identified four main styles: Vaidarbhi, Gaudi, Panchali, and Lata.

Alamkara, or ornamentation, is used in Indian literary theory to enhance the beauty and appeal of the text. It involves the use of figurative language, imagery, and other rhetorical devices.

Anandavardhana, in his work 'Dhvanyaloka', introduced the concept of 'Dhwani' or suggestion. He argued that the true meaning of a literary text lies not in its literal sense but in its suggested or implied meaning.

Jagannatha, in his work 'Rasagangadhara', argued that rasa is a complex and multifaceted concept that encompasses universal, contextual, and subjective elements.

Bhartrihari, in his work 'Vakyapadiya', explored the relationship between language, thought, and reality. He argued that words have the power to create and shape our understanding of the world.

Mammata, in his work 'Kavyaprakasha', focused on the classification and analysis of poetic ornaments or 'alamkaras'. He identified and described various types of alamkaras and their usage in literary texts.

Visvanatha Kaviraja, in his work 'Sahitya Darpana', provided a comprehensive overview of Indian literary theory. He discussed various aspects of literature, including rasa, alamkara, riti, and dhvani.

Udbhata, in his work 'Kavyalankara', focused on the use of figurative language or 'alamkaras' in poetry. He discussed various types of alamkaras and their effects on the reader's experience.

Abhinavagupta, in his work 'Rasa Tarangini', explored the concept of rasa or aesthetic experience in detail. He discussed the various types of rasas and their relationship to the emotions of the audience.

Bhoja, in his work 'Srngara Prakasa', focused on the analysis of erotic sentiment or 'srngara rasa'. He discussed the various aspects of srngara and its portrayal in literature.

Rajashekhara, in his work 'Kavya Mimamsa', discussed various aspects of literary theory, including the nature of poetry, the role of the poet, and the interpretation of literary texts.