This document discusses language acquisition and learning. It notes that language acquisition is a natural and subconscious process that occurs when people are exposed to a language from an early age, as is the case with first language acquisition in children. Language learning, on the other hand, is a more conscious process that can involve studying grammar rules. The document also discusses second language acquisition and notes some key differences from first language acquisition, including the importance of exposure, comprehension, and interaction/practice. The remainder of the document discusses the history of adopting mother tongue-based multilingual education (MTB-MLE) in the Philippines, including an initial pilot project, and highlights research showing cognitive, educational, and proficiency benefits of using students' mother tongues