Section 1 is a dialog on a mundane subject usually invoving spelling phone numbers, addresses and prices over phone.
Section 2 is a monologue on an everyday subject, usually some kind of briefing or orientation.
Section 3 is a discussiion on an academic subject.
Section 4 is an academic monologue, e.g., a lecture.
International English Language Testing System (IELTS)
It is an international standardised test of English language proficiency for non-native English language speakers. Probably, it is the most popular formal English test in the world.
IELTS Listening
Candidates listen to four recordings of native English speakers and then write your answers to a series of questions. Assessors will be looking for evidence of candidates' ability to understand the main ideas and detailed factual information, the opinions and attitudes of speakers, the purpose of an utterance and evidence of test takers' ability to follow the development of ideas.