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彼女は英語が話せます。
She can speak English.
The language originating in England and used as a global lingua franca.
英語を勉強しています。
I am studying English.
英語の辞書を買いました。
I bought an English dictionary.
Used to refer to the language itself, not the people or culture.
英語 refers to the English language in general, while 英米語 (eigo-beigo) specifically refers to British and American English, often used in contrast to other English dialects.
Use 英語 when referring to the language itself, its study, or general communication in English. Avoid using it to describe English-speaking people or culture unless contextually clear.
From 中英語 'Englische' (language of the English), ultimately from Old English 'Englisc' (relating to the Angles).
英語 is the standard term for the English language in Japanese, used in formal and informal contexts. It does not imply British or American English unless specified.