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शुल्बसूत्राणि || Shulba Sutras explain the different systems of measurements. Aspects of measurements of various वेदिनिर्माणविधिः || vedinirmanavidhi (altars and the procedure to construct them). For Example, होमशाला || homa shala, यज्ञशाला || yajnashala are discussed. Thus, वैदिककर्मकाण्डः || Vaidika Karmakanda is the topic for Shulbasutras, wherein geometry or the रेखागणितम् || Rekhaganita is applied. Only those Shulbasutras associated with यजुर्वेदः || Yajurveda are available extensively indicating that Yajurveda is the main base for karmakanda. कात्यायनः || Katyayana,  मानवः || Manava , बौधायनः || Baudhayana, आपस्तम्बः || Apastamba, मैत्रेयी || Maitreyi, वाराहः || Varaha, वाधूलः || Vadhula shulba sutras are the important ones in this category.

शुल्बसूत्राणि || Shulba Sutras explain the different systems of measurements. Aspects of measurements of various वेदिनिर्माणविधिः || vedinirmanavidhi (altars and the procedure to construct them). For Example, होमशाला || homa shala, यज्ञशाला || yajnashala are discussed. Thus, वैदिककर्मकाण्डः || Vaidika Karmakanda is the topic for Shulbasutras, wherein geometry or the रेखागणितम् || Rekhaganita is applied. Only those Shulbasutras associated with यजुर्वेदः || Yajurveda are available extensively indicating that Yajurveda is the main base for karmakanda. कात्यायनः || Katyayana,  मानवः || Manava , बौधायनः || Baudhayana, आपस्तम्बः || Apastamba, मैत्रेयी || Maitreyi, वाराहः || Varaha, वाधूलः || Vadhula shulba sutras are the important ones in this category.

=== व्याकरणम् ॥ Vyakarana ===

=== व्याकरणम् ॥ Vyakarana ===

व्याकरणम् ॥ Vyakarana is described as the वेद पुरुष || Veda purusha's face.<blockquote>व्याक्रियन्ते शब्दाः अनेन इति व्याकरणम् । vyākriyante śabdāḥ anena iti vyākaraṇam । </blockquote>is the व्युत्पत्ति-अर्थः || vyutpatti artha or the subjective definition of word.

व्याकरणम् ॥ Vyakarana is described as the वेद पुरुष || Veda purusha's face.<blockquote>व्याक्रियन्ते शब्दाः अनेन इति व्याकरणम् । vyākriyante śabdāḥ anena iti vyākaraṇam । </blockquote><blockquote>व्याक्रियन्ते व्युत्पाद्यन्ते साधुशब्दा अस्मिन् अनेनेति वा . इति दुर्गादासः .. is the व्युत्पत्ति-अर्थः || vyutpatti artha or the subjective definition of word according to Durgadasa in Shabdakalpadruma</blockquote>Shabdakalpadruma also gives deliberates on the content matter of Vyakarana as "तत्र साध्यसाधनकर्त्तृकर्म्मक्रिया-समासादिनिरूपणम् ." One where all grammatical aspects (vibhaktis, samasas etc are shown or derived)

This shastra only deliberates on the शुद्धि-अशुद्धि || shuddhi-ashuddhi (accurate and inaccurate) usages of words in संस्कृतवाङ्मयम् || Sanskrita vangmaya (sanskrit literature). It is the grammar of संस्कृतश्लोकाः || sanskrit shlokas and it deals with the formation of words, different forms of the words and their combination, usage and semantic nuances. Although, ऋगवेद || Rigvedic references to grammar are available, it is only the तैत्तिरीयसंहिता || Taittireeya samhita that outlines the story of origin of grammar. In महर्षि यास्क || Maharshi Yaska's निरुक्तम् || Nirukta, different technical or conventional terms related to grammar are available in abundance.   

This shastra only deliberates on the शुद्धि-अशुद्धि || shuddhi-ashuddhi (accurate and inaccurate) usages of words in संस्कृतवाङ्मयम् || Sanskrita vangmaya (sanskrit literature). It is the grammar of संस्कृतश्लोकाः || sanskrit shlokas and it deals with the formation of words, different forms of the words and their combination, usage and semantic nuances. Although, ऋगवेद || Rigvedic references to grammar are available, it is only the तैत्तिरीयसंहिता || Taittireeya samhita that outlines the story of origin of grammar. In महर्षि यास्क || Maharshi Yaska's निरुक्तम् || Nirukta, different technical or conventional terms related to grammar are available in abundance.