What are the differences between comprehensible input and comprehensible output?

Comprehensible input refers to language input that is slightly above a learner's current proficiency level, making it understandable while still challenging, facilitating language acquisition. In contrast, comprehensible output involves the learner's production of language, such as speaking or writing, which forces them to organize their thoughts and use the language actively. While input focuses on receiving and processing language, output emphasizes the learner's ability to express and apply what they have learned. Both are essential for effective language learning, as input provides the necessary exposure and output reinforces language use.