English as a second or foreign language refers to the use of English by individuals whose native language is different, commonly among students learning to speak and write English. Variably known as English as a foreign language (EFL), English as a second language (ESL), English for speakers of other languages (ESOL), English as an additional language (EAL), or English as a new language (ENL), these terms denote the study of English in environments where it is not the dominant language. Programs such as ESL are designed as academic courses to instruct non-native speakers in English proficiency, encompassing both learning in English-speaking nations and abroad.