die Tageskarte
day ticket
A ticket for public transportation that is valid for an entire day.
Für die Fahrten durch die ganze Stadt kaufe ich mir am besten eine Tageskarte.
For trips around the whole city, I'd best buy myself a day ticket.

day ticket / daily menu
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day ticket
A ticket for public transportation that is valid for an entire day.
Für die Fahrten durch die ganze Stadt kaufe ich mir am besten eine Tageskarte.
For trips around the whole city, I'd best buy myself a day ticket.

The word is made up of 'der Tag' (the day; in the genitive 'des Tages') and 'die Karte' (the card/ticket/menu). So it describes a card, ticket, or menu that is valid or offered for a particular day.
Fragen Sie den Kellner, was heute auf der Tageskarte steht.
Ask the waiter what's on the daily menu today.
You can easily recognize the meaning from the context. In connection with buses, trains, and public transportation, it means the ticket. In a restaurant or café, it means the menu of the day.
Am Automaten können Sie eine Tageskarte für alle Zonen kaufen.
At the ticket machine, you can buy a day ticket for all zones.
When referring to the ticket, the verbs 'kaufen' (to buy), 'lösen' (to buy/validate a ticket), 'haben' (to have), or 'brauchen' (to need) are often used.
Wir müssen noch eine Tageskarte für die U-Bahn lösen.
We still need to buy a day ticket for the subway.
In a restaurant, dishes are 'auf der Tageskarte' (on the daily menu). You can order, choose, or recommend something 'von der Tageskarte' (from the daily menu).
Der Kellner hat uns den Fisch von der Tageskarte empfohlen.
The waiter recommended the fish from the daily menu to us.
card / map
'die Karte' and 'die Tageskarte' can both mean a ticket or a menu. Here, 'Karte' is the general word: it can be an admission ticket, a public transport ticket, or the regular menu in a restaurant. 'Tageskarte' is more specific. In transportation, it is a ticket that is valid for a whole day. In a restaurant, it is a menu with dishes that are offered only on that day. The words can be confused because they occur in the same situations. If the validity or the offer being limited to one day is important, you say 'Tageskarte'. Otherwise, 'Karte' is usually enough.

Nach der Arbeit kaufe ich eine Tageskarte, weil ich heute noch mehrmals mit der Bahn fahre.
After work, I buy a day ticket because I will take the train several more times today.
Vor dem Konzert zeigt Anna ihre Karte am Eingang.
Before the concert, Anna shows her ticket at the entrance.