The Noticing Hypothesis, proposed by Schmidt (1990), asserts that learners must consciously notice linguistic forms in input for them to become intake, facilitating language acquisition. This hypothesis emphasizes the importance of drawing learners' attention to specific language features through techniques like input enhancement, recasts, and consciousness-raising tasks. It suggests that noticing gaps between their interlanguage and the target language helps learners refine accuracy and fluency. While the hypothesis has significantly influenced language teaching by promoting explicit and implicit noticing strategies, it faces criticisms for overemphasizing explicit instruction and neglecting incidental learning. Critics also highlight challenges in measuring noticing and its applicability across diverse learner profiles. Despite these limitations, the Noticing Hypothesis offers valuable insights for designing effective language instruction, balancing form-focused and communicative approaches. By integrating noticing activities into lessons, educators can enhance learners' awareness of linguistic forms, fostering both accuracy and fluency in second language acquisition.