This enables students to complete the activity successfully.
Example
The learners are going to hear a short discussion on environmental issues. Before listening, they match key environment words to definitions.
In the classroom
In order to pre-teach vocabulary effectively, the teacher needs to identify what the learners already know and what might cause problems. Although course books often provide this information in pre-teaching stages, many teachers take time when planning to identify problem areas.
Further links:
https://www.teachingenglish.org.uk/article/teens-listening-skills
https://www.teachingenglish.org.uk/article/kids-stories
https://www.teachingenglish.org.uk/blogs/larry-ferlazzo/larry-ferlazzo-five-strategies-ell-vocabulary-instruction
https://www.teachingenglish.org.uk/article/increasing-student-interaction
https://www.teachingenglish.org.uk/article/using-authentic-materials
https://www.teachingenglish.org.uk/article/motivating-speaking-activities-lower-levels
I think this is a good way to open a lesson or present to students.