In Marathi grammar, proper nouns or ‘व्यक्तीवाचक संज्ञा’ are the names of specific people, brands, events, or places. They represent unique entities, unlike common nouns which are generic names for a class of items or a concept. Proper nouns are always capitalized in Marathi, just like in English. An understanding and correct usage of proper nouns is crucial for mastering the Marathi language.