der Verkauf
sale
The process in which goods or a service are handed over to a buyer in exchange for money.
Der Verkauf des Hauses wurde letzte Woche notariell beurkundet.
The sale of the house was notarized last week.

sale / sales
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sale
The process in which goods or a service are handed over to a buyer in exchange for money.
Der Verkauf des Hauses wurde letzte Woche notariell beurkundet.
The sale of the house was notarized last week.

'Der Verkauf' (the sale/sales) is the noun for the verb 'verkaufen' (to sell). The process in which you sell something is 'der Verkauf' (the sale).
Er will sein altes Auto verkaufen.
He wants to sell his old car.
A very common expression is 'etwas steht zum Verkauf' (something is for sale). It means that something can be bought.
Das Nachbarhaus steht seit letzter Woche zum Verkauf.
The neighboring house has been for sale since last week.
The preposition helps you recognize the meaning. 'Der Verkauf von etwas' (the sale of something) describes the action. 'Im Verkauf arbeiten' (to work in sales) or 'in den Verkauf gehen' (to go into sales) refers to the department or profession.
Der Verkauf der Konzertkarten beginnt morgen um 10 Uhr.
The sale of the concert tickets begins tomorrow at 10 a.m.
To say what is being sold, you usually use the genitive or the preposition 'von' + dative. The genitive is somewhat more formal.
Der Verkauf des Grundstücks muss noch genehmigt werden.
The sale of the property still has to be approved.
purchase
'der Kauf' and 'der Verkauf' belong to the same situation involving money and goods, but they show two opposite sides. In a 'Kauf', someone receives something and pays for it. In a 'Verkauf', someone gives something away and receives money for it. They are easy to confuse because it is often the same action, just from a different point of view. Memory tip: The customer talks about 'Kauf', while the dealer or owner talks about 'Verkauf'.

Für den Verkauf des alten Sofas macht Max Fotos und stellt sie ins Internet.
To sell the old sofa, Max takes photos and posts them online.
Vor dem Kauf des Fahrrads prüft Anna noch einmal die Bremsen.
Before buying the bicycle, Anna checks the brakes one more time.