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ESL stands English as the second language and means learning English in an English speaking country like UK, USA.
EFL stands for English as a foreign language and means English in a non native speaking country like Qatar, Oman etc.
A second language means it is the second language used in the same country( it has an official language and a second one) ,foreign language means it is taught as a language not used as the official language by some members within the country.
the same as long it is not native language
Technically, it is the same. Studying ESL (English as a second language) means that it is not your mother tongue, i.e. it is a foreign language for you
English is the lingua franca of business and academia.
Chinese refers to a group of Sino-Tibetan languages.
Spanish
Arabic
German