All About Bharatiya Sanatana Dharmam otherwise known as Hinduism : 2.1.15 & 16.
CHAPTER 2. HINDU SCRIPTURES : 1.15 & 16.
1.The Scriptures : 15 & 16.
15. Vritti & 16. Varttika
A Vritti is a short gloss explaining the aphorisms in a more elaborate way, but not as extensively as a Bhashya. An example is Bodhayana’s Vritti on the Brahma Sutras.
Chinta yatra pravartate
Tam grantham varttikam prahuh
A Varttika is a work where a critical study is made of that which is said and left unsaid or imperfectly said in a Bhashya, and the ways of making it perfect by supplying the omissions therein, are given. Examples are the Varttikas of Katyayana on Panini’s Sutras, of Suresvara on Sankara’s Upanishad-Bhashyas, and of Kumarila Bhatta on the Sabara-Bhashya on the Karma-Mimamsa.
Next : 17. Vyakhyana or Tika & 18. Tippani
To be continued...