Comprehensible input has a pretty straight forward definition. It's language before or just after the end of understanding. Maybe 80-90 percent known words so y

Comprehensible input has a pretty straight forward definition. It's language before or just after the end of understanding. Maybe 80-90 percent known words so you can get the context of what's being said. If you can't grab hold of context of what's being said you won't really pick much up. That's why total immersion isn't effective for beginners.