einkaufen
to shop
To buy everyday goods, especially groceries, in stores.
Freitagnachmittag gehe ich immer für das Wochenende einkaufen.
On Friday afternoons, I always go shopping for the weekend.

to shop
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to shop
To buy everyday goods, especially groceries, in stores.
Freitagnachmittag gehe ich immer für das Wochenende einkaufen.
On Friday afternoons, I always go shopping for the weekend.

'Einkaufen' (to shop) is a separable verb. The prefix 'ein-' comes at the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Ich kaufe schnell für das Abendessen ein.
I'll quickly shop for dinner.
'Einkaufen' (to shop) is often used without a direct object to describe the general activity of shopping. A very common combination is 'einkaufen gehen' (to go shopping).
Am Samstagvormittag gehen viele Leute einkaufen.
Many people go shopping on Saturday mornings.
This special meaning has a fixed grammatical structure: 'sich in etwas (Akkusativ) einkaufen' (to buy into something). Here the verb is always reflexive.
Der Investor wollte sich in den erfolgreichen Fußballverein einkaufen.
The investor wanted to buy into the successful football club.
This meaning of 'einkaufen' (to buy into) is used almost exclusively in an economic or business context. It is about becoming part of something through money.
Sie hat sich in die Anwaltskanzlei eingekauft und ist jetzt Partnerin.
She bought into the law firm and is now a partner.
to buy
'kaufen' and 'einkaufen' both mean that you get goods in exchange for money. 'kaufen' is more general and fits almost any individual item, for example a bicycle, a book, or a ticket. 'einkaufen' is used more for the whole trip or activity, especially when you are getting groceries or everyday items. So you are more likely to say 'Ich kaufe ein Brot' (I am buying a loaf of bread) for the individual item, but 'Ich gehe einkaufen' (I am going shopping) for the whole errand.

Nach dem Unterricht kauft der Mitarbeiter noch für das Abendessen ein.
After class, the employee does some shopping for dinner.
Kannst du auf dem Heimweg bitte Brot kaufen?
Could you please buy bread on your way home?