der Gastgeber
host
A person who has invited guests to their home and takes care of their food, drink, and well-being.
Der Gastgeber begrüßte jeden Gast persönlich an der Tür.
The host greeted each guest personally at the door.

host
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host
A person who has invited guests to their home and takes care of their food, drink, and well-being.
Der Gastgeber begrüßte jeden Gast persönlich an der Tür.
The host greeted each guest personally at the door.

The word is made up of 'Gast' (guest) and 'geben' (to give). A 'Gastgeber' (host) is therefore literally someone who gives something to their guests, for example food, drink, and accommodation.
Ein guter Gastgeber sorgt dafür, dass sich seine Gäste wohlfühlen.
A good host makes sure that their guests feel comfortable.
Common phrases are 'ein guter/schlechter Gastgeber sein' (to be a good/bad host), 'die Rolle des Gastgebers übernehmen' (to take on the role of host), and 'sich bei den Gastgebern bedanken' (to thank the hosts).
Wir möchten uns bei euch für den schönen Abend bedanken, ihr wart tolle Gastgeber.
We would like to thank you for the lovely evening; you were wonderful hosts.
You can recognize this meaning from the context of large, organized events. The words 'Gastgeberland' (host country) or 'Gastgeberstadt' (host city) are often used here as well.
Paris ist der Gastgeber der nächsten Olympischen Spiele.
Paris is the host of the next Olympic Games.
In the biological or medical meaning, 'Gastgeber' (host) is a technical term. You can recognize it from words such as 'Virus' (virus), 'Parasit' (parasite), 'Organismus' (organism), or 'Wirt' (host) in the same context.
Die Fledermaus gilt als möglicher Gastgeber des Virus.
The bat is considered a possible host of the virus.
guest
'der Gast' and 'der Gastgeber' belong to the same situation, but they have opposite roles. The guest is the person who is invited or comes to visit. The host is the person who invites others and takes care of the guests. Learners can easily confuse the words because they sound similar and both appear in the context of visits or celebrations. Remember: the host gives the invitation, and the guest accepts it.

Für das Sommerfest ist Ali der Gastgeber und begrüßt alle an der Tür.
For the summer party, Ali is the host and greets everyone at the door.
Frau Neumann war gestern als Gast bei einer kleinen Feier.
Yesterday, Ms. Neumann was a guest at a small celebration.