der Verkäufer
salesman
A male person whose job is to sell goods or services, for example in a store or for a company.
Der Verkäufer im Elektronikmarkt hat mich sehr gut beraten.
The salesman at the electronics store gave me very good advice.

salesman / seller
Loading your saved state.
salesman
A male person whose job is to sell goods or services, for example in a store or for a company.
Der Verkäufer im Elektronikmarkt hat mich sehr gut beraten.
The salesman at the electronics store gave me very good advice.

'Der Verkäufer' (the salesman/seller) is derived directly from the verb 'verkaufen' (to sell). The ending '-er' here refers to the male person who performs the action of the verb.
Er arbeitet als Verkäufer in einem Möbelgeschäft.
He works as a salesman in a furniture store.
You can recognize the meaning 'profession' from the context of a store, company, or department. Words like 'Laden' (shop), 'Markt' (market/store), 'beraten' (to advise), or 'Kunde' (customer) point to this meaning.
Der Verkäufer hat mir die verschiedenen Modelle gezeigt.
The salesman showed me the different models.
You can recognize the meaning 'party in a contract' from the context of legal or large private transactions. Words like 'Käufer' (buyer), 'Vertrag' (contract), 'Haus' (house), 'Auto' (car), or 'Notar' (notary) point to this meaning.
Der Verkäufer und der Käufer müssen beide den Vertrag unterschreiben.
The seller and the buyer both have to sign the contract.
customer
'der Kunde' and 'der Verkäufer' both belong to a buying situation, but they are on different sides. The customer buys something or uses a service. The seller sells the goods or offers the service. In a shop, the seller is often the professional person behind the counter. In a contract, the seller can also be the person who sells something such as a car or a house. Learners may confuse the words because both appear in the same situation. The simple guideline is: the customer pays, the seller sells.

Der Verkäufer zeigt dem Kunden ein günstigeres Modell.
The seller shows the customer a cheaper model.
Im Laden fragt der Kunde nach einer anderen Größe.
In the store, the customer asks for a different size.