Collective Nouns, or Pang-uring Pampanuto in Tagalog grammar, are special nouns that are used to denote a group or collection of similar individuals or things. They play a crucial role in describing entities as a whole rather than as isolated units, emphasizing their collective nature. Instead of naming every single item, collective nouns provide a concise and specific reference to a group. This makes conversations and writing in Tagalog more effective and efficient.