die Kellnerin
waitress
A woman whose job is to serve guests in a restaurant, café, or bar, take orders, and serve food and drinks.
Die Kellnerin empfahl uns den Wein des Hauses.
The waitress recommended the house wine to us.

waitress
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waitress
A woman whose job is to serve guests in a restaurant, café, or bar, take orders, and serve food and drinks.
Die Kellnerin empfahl uns den Wein des Hauses.
The waitress recommended the house wine to us.

The word is the feminine form of 'der Kellner' (waiter). The ending '-in' is often used in German to form the feminine version of job titles and other terms for people.
Der Kellner und die Kellnerin arbeiten im selben Restaurant.
The waiter and the waitress work in the same restaurant.
In everyday restaurant situations, certain verbs are typical: you can 'die Kellnerin rufen' (call the waitress), 'bei der Kellnerin bestellen' (order from the waitress), or 'die Kellnerin um die Rechnung bitten' (ask the waitress for the bill).
Wir sollten bei der Kellnerin noch zwei Gläser Wasser bestellen.
We should order two more glasses of water from the waitress.
To get a waitress's attention, you politely say 'Entschuldigung!' (Excuse me!). The direct form of address 'Frau Kellnerin' is no longer used in modern German and sounds unnatural.
Entschuldigung, wir würden gern bezahlen!
Excuse me, we'd like to pay!
waiter
'der Kellner' and 'die Kellnerin' both refer to a person who serves guests in a restaurant, café, or bar. The difference is the gender of the person: 'der Kellner' means a man, and 'die Kellnerin' means a woman. Learners may confuse the words because the job is the same and only the article and ending are different. If the gender is unknown or not important, you also often hear general forms like 'Bedienung' (server / service staff) in everyday language.

Die Kellnerin hat Ida heute freundlich einen Platz am Fenster gezeigt.
The waitress kindly showed Ida to a table by the window today.
Der Kellner bringt uns nach der Bestellung zwei Gläser Wasser.
After we order, the waiter brings us two glasses of water.