What does the acronym ESL mean?

The acronym ESL stands for "English as a Second Language," which accurately reflects the concept of teaching or learning English by individuals whose first language is not English. This term is widely used in educational settings to designate courses and programs that focus on helping non-native speakers acquire proficiency in English, particularly in speaking, reading, writing, and listening skills.

This choice is fundamental as it captures the essence of language education for learners who are immersing themselves in a new linguistic environment, often for purposes such as work, study, or integration into English-speaking communities. Other terms, like those presented in the other options, do not correctly encompass the widely accepted definition and usage of ESL in the context of language learning.