
das Fenster
window
An opening in a wall, usually fitted with glass, that lets light and air into a room.
Mach bitte das Fenster auf, es ist sehr warm hier drin.
Please open the window; it's very warm in here.
window
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window
An opening in a wall, usually fitted with glass, that lets light and air into a room.
Mach bitte das Fenster auf, es ist sehr warm hier drin.
Please open the window; it's very warm in here.

window
In computing, a rectangular area on the screen in which a program or certain content is displayed.
Ich habe zu viele Fenster geöffnet und mein Computer ist langsam.
I have too many windows open, and my computer is slow.

window
A limited period of time in which a certain action is possible or favorable. Often used as 'Zeitfenster' (time window).
Das Start-up hat nur ein kleines Fenster, um Investoren zu überzeugen.
The start-up has only a small window to convince investors.
Pay attention to the prepositions: 'ans Fenster' (to the window, with accusative) describes movement toward the window, while 'am Fenster' (at/by the window, with dative) describes a position.
Er geht ans Fenster, um die Vögel zu beobachten.
He goes to the window to watch the birds.
In connection with a real window, the verbs 'öffnen' (to open), 'schließen' (to close), and 'putzen' (to clean) are often used. Colloquially, you also hear 'aufmachen' (to open) and 'zumachen' (to close).
Könntest du bitte das Fenster schließen? Es zieht.
Could you please close the window? There's a draft.
When talking about computers, programs, or the internet, 'Fenster' means a separate area on the screen. Typical verbs here are 'öffnen' (to open), 'schließen' (to close), or 'minimieren' (to minimize).
Schließe bitte alle unnötigen Fenster, damit der Computer schneller wird.
Please close all unnecessary windows so the computer gets faster.
In the figurative meaning, 'Fenster' describes a limited period of time. It is often used as 'Zeitfenster' (time window) to make this clear.
Wir haben nur ein kleines Zeitfenster, um das Projekt erfolgreich abzuschließen.
We have only a small time window to complete the project successfully.
windowpane
Fenster refers to the opening together with the complete unit, while Fensterscheibe refers only to the glass fitted into it. If the frame and glass are replaced together, Fenster is the appropriate term. If only the damaged glass is being replaced, Fensterscheibe is more precise.

Nach dem Sturm ließ die Familie das Fenster komplett austauschen.
After the storm, the family had the entire window replaced.
Nach dem Sturm ließ die Familie nur die Fensterscheibe austauschen.
After the storm, the family had only the windowpane replaced.