Intensive reading or listening is when we read closely to find detailed information and reach a thorough understanding of a text.

Extensive reading and listening refers to approaching longer texts, which are read more rapidly for a more general global understanding.

Extensive reading in language learning is when students read texts for pleasure and for developing their general reading skills; they are not required to do tasks.

Classroom reading and listening lessons usually involve intensive reading/listening, which means reading closely to complete specific tasks.

Extensive reading  and listening are probably the best ways of improving comprehension and expanding vocabulary. It is useful for teachers to find ways of encouraging students to read and listen extensively as well as intensively.