Comprehensible input is language you hear or read that is mostly understandable but slightly above your current level. It's one way we acquire language naturally. You need enough of it, and you also need output—speaking—to get better at producing English.
Input (listening, reading) exposes you to new language. Output (speaking, writing) forces you to use it. Both matter. Rozy focuses on output: you speak and get feedback. Combining Rozy with listening and reading gives you a strong balance.
If input is too easy you don't learn; if it's too hard you switch off. Material that is mostly clear but has some new words or structures is ideal. Then use what you've understood in speaking practice with Rozy.
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