to exchange
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to exchange
To give something away and receive something else in return; to make an exchange or trade.
Im Laden kann man sein altes Smartphone gegen einen Gutschein für ein neues Modell eintauschen.
At the store, you can exchange your old smartphone for a voucher toward a new model.
'Eintauschen' (to exchange) is a separable verb. The prefix 'ein-' comes at the end in a main clause, the verb stays together in a subordinate clause, and in the infinitive with 'zu', 'zu' goes in the middle.
Ich tausche meine alten Bücher gegen neue ein.
I exchange my old books for new ones.
The structure for an exchange is almost always: 'etwas (Akkusativ) gegen etwas anderes (Akkusativ) eintauschen' (to exchange something for something else). The preposition 'gegen' (for/against) is essential here.
Sie können Ihre Treuepunkte gegen einen Einkaufsgutschein eintauschen.
You can exchange your loyalty points for a shopping voucher.
Old or used things are often exchanged, for example 'ein altes Handy eintauschen' (to trade in an old phone). But you can also exchange abstract things like 'Punkte' (points) or 'Meilen' (miles) for rewards.
Beim Kauf eines neuen Laptops konnte ich mein altes Gerät eintauschen und bekam einen Rabatt.
When buying a new laptop, I was able to trade in my old device and got a discount.
to sell
'verkaufen' and 'eintauschen' both have to do with giving something away. The important difference is what you get in return. With 'verkaufen', you get money. With 'eintauschen', you get another item or another kind of value, but not simply the purchase price. Learners may confuse the words because in both cases the owner changes. As a practical rule: if money is being paid, 'verkaufen' usually fits. If it is thing for thing, 'eintauschen' fits.
Im Laden kann man alte Flaschen gegen einen Gutschein eintauschen.
At the store, you can exchange old bottles for a voucher.
Mein Vater hat sein altes Fahrrad für fünfzig Euro verkauft.
My father sold his old bicycle for fifty euros.