A (, , Commentator), in Indian linguistics and philosophy, is a person who wrote a critical commentary or a gloss on a given grammatical or philosophical work.
Monier Williams Dictionary defines VÃÂrttikakÃÂra as a composer of vÃÂrttikas. A vÃÂrttika is defined as a single remark or a whole work attempting to present a detailed commentary. The word vÃÂrttik- derives from , either in the sense of 'the turning () of sà «tra-formulation into a fully worded paraphrase' or, in the sense of 'procedure (of the teaching)'. According to the Indian tradition, the purpose of a vÃÂrttika is to enquire into what has been said (ukta), what has not been said (anukta), and what has not been said clearly (durukta).