film / slide
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film / foil
A thin, flexible material made of plastic or metal that is used for wrapping, covering, or protecting something.
Kannst du den restlichen Kuchen bitte mit Folie abdecken?
Could you please cover the rest of the cake with film?
'Folie' can mean something like the English 'foil' (aluminum foil), but it is a much broader term. It often refers to thin plastic material, such as plastic wrap.
Wickle das Sandwich für den Transport in Folie ein.
Wrap the sandwich in film for transport.
The context makes the meaning clear. Words like 'Küche' (kitchen), 'abdecken' (to cover), or 'verpacken' (to package/wrap) point to the material. Words like 'Präsentation' (presentation), 'Vortrag' (talk/presentation), or 'Projektor' (projector) point to the page in a presentation.
Bitte decken Sie die Schüssel mit Frischhaltefolie ab.
Please cover the bowl with plastic wrap.
In a household context, 'Folie' (film/foil) is often used in compounds such as 'Alufolie' (aluminum foil) or 'Frischhaltefolie' (plastic wrap/cling film). Typical verbs are 'in Folie einwickeln' (to wrap in film/foil) or 'mit Folie abdecken' (to cover with film/foil).
Der Fisch wird in Alufolie gegrillt, damit er saftig bleibt.
The fish is grilled in aluminum foil so that it stays juicy.
In the context of presentations, typical phrases are 'eine Folie zeigen' (to show a slide), 'auf der nächsten Folie' (on the next slide), or 'eine Folie erstellen' (to create a slide).
Auf der letzten Folie finden Sie meine Kontaktdaten.
On the last slide, you will find my contact details.
page / side
'die Seite' and 'die Folie' can both occur in a presentation. 'Seite' is more general and can mean a page in a book, document, or even a presentation. 'Folie' is used especially for a single slide in a digital presentation, for example in PowerPoint. Learners may confuse the words because you often hear both in presentations. If you are talking about a book or a normal document, 'Seite' is correct. If you are talking about a presentation with individual screen pages, 'Folie' sounds more precise and natural.
Auf der letzten Folie zeigt Mehmet die wichtigsten Ergebnisse.
On the last slide, Mehmet shows the most important results.
Zur Vorbereitung hat Lisa die wichtigste Seite im Bericht markiert.
To prepare, Lisa marked the most important page in the report.