The idea that there is empirical evidence proving that humans have a critical period for acquiring language is, indeed, a great accomplishment. This remarkable phenomenon in which language acquisition participates is known as the critical period hypothesis. From the first incoherent chatter to the utterance of a child's first word, scientists have managed to unravel the mystery of understanding language acquisition. The critical period hypothesis originally came from linguist and neurologist Eric Heinz Lenneberg. Linguists believe that language, in itself, constitutes an essential element of learning. There is substantial evidence of a critical language period that comes from studies of bilinguals, deaf children who use sign language, and extreme cases of feral children like Victor and Genie who have shed light on the acquisition of language. The process of acquiring a second language is based largely on empirical evidence which suggests that the earlier a child can understand a second language, the better. Bilingual children are able to easily detect the nuances of different meanings in both of their languages, whether it is English or Spanish. The difference between monolingual and bilingual children is that bilingual children have the advantage of discriminating certain utterances between their two languages ​​and above all they seem prepared for the mechanism of language. It is true that children who acquire a second language are strongly influenced by their adapted environment and that if this particular amount of time passes, then it would be much more difficult for a child to speak more than one language. critical period for early childhood development like those conducted by Marian...... middle of paper ...... children learn it so easily with minimal effort. One might wonder how the brain achieves this. While in the midst of all these questions, our cognitive processes discern critical thinking or rationalization. Strong empirical evidence supports the critical period hypothesis. Case studies of individuals capable of acquiring a second language, deaf individuals who communicate via sign language or various signals, extreme cases of childhood neglect all trace back to the understanding of language acquisition. If a child is not exposed to language earlier, then poor exposure to the environment and society prevents language acquisition. In contrast, studies of deaf children indicate difficulty learning a language after early childhood, which may be due to the individual's difficulty developing mental abilities..