there are two parts of a charger when charging a phone. one is the wire , and what’s the other part called? the one connect with the socket? in English (US)?

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if you’re talking about what i’ve displayed in the picture below, it’s called many things. officially speaking, this accessory is called an “adapter,” but a lot of people have their own words for it. it’s also referred to as a charging block, box or— with iphone adapters such as these— a cube. any of these are correct to use