
der Gast
guest
A person whom you invite to your home or to an event and entertain or provide hospitality for.
Wir erwarten heute Abend Gäste zum Essen.
We are expecting guests for dinner this evening.
guest
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guest
A person whom you invite to your home or to an event and entertain or provide hospitality for.
Wir erwarten heute Abend Gäste zum Essen.
We are expecting guests for dinner this evening.

guest / customer
A person who uses the services of a hotel, restaurant, or another hospitality establishment; a customer.
Der Kellner brachte dem Gast die Speisekarte.
The waiter brought the guest the menu.

guest
A person who participates in an event, a program, or an institution for a limited time without being a permanent member.
In der heutigen Talkshow ist ein berühmter Schauspieler zu Gast.
A famous actor is a guest on today's talk show.
A 'Gast' (guest) at home is an invited person. A 'Gast' (guest/customer) in a restaurant or hotel is a paying customer. The context (private or business) determines the exact meaning.
Meine Eltern haben am Wochenende Gäste zum Kaffee da.
My parents are having guests over for coffee at the weekend.
'Gast' (guest) is often used as the first part of compound words to describe a temporary role. Examples include 'der Gastarbeiter' (guest worker), 'der Gastprofessor' (visiting professor), or 'der Gastauftritt' (guest appearance).
Die Universität hat für dieses Semester einen Gastprofessor aus Japan eingeladen.
The university has invited a visiting professor from Japan for this semester.
The expression 'zu Gast sein' (to be a guest) is very common and means that someone is temporarily present at a place or at an event. It is often used with the preposition 'bei' (at/with) or 'in' (in).
Nächste Woche ist eine berühmte Autorin in unserer Schule zu Gast.
Next week, a famous author will be a guest at our school.
customer
In a restaurant, der Kunde and der Gast can refer to the same person. Kunde focuses on the person as the buyer of a service, for example when paying or making a complaint. Gast, by contrast, emphasizes the person’s stay and the hospitable service they receive; from the restaurant’s perspective, this term is usually more appropriate.

Als Gast wird Paul im Restaurant freundlich an seinen Tisch begleitet.
As a guest, Paul is courteously shown to his table in the restaurant.
Als Kunde reklamiert Paul einen Fehler auf der Restaurantrechnung.
As a customer, Paul complains about an error on the restaurant bill.