Languages often borrow from one another: it’s a common source of linguistic growth and change. Normally what gets borrowed is words, called ‘loans’, ‘loanwords’, or ‘borrowings’ (though the terms suggest eventual return, which isn’t how it works). Any word that isn’t a loanword is a native word.
English is a frequent borrower, being full of loanwords from many other languages. This ability to integrate foreign forms is one reason for its success. And it goes both ways: because of English’s status and reach, it’s a common ‘donor language’ for others. The World Loanword Database is a useful resource on the phenomenon.
Less often, other linguistic elements are borrowed, like grammatical structures or pronunciations. An example of the former is because X, a popular construction in informal English.* I first wrote about because X in 2013, elsewhere picking it as my word of the year (the American Dialect Society later did likewise). Such was its impact that the phrase was discussed not just by linguists but by more mainstream outlets.