paper
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paper
A thin, flat material that is usually made from cellulose and used for writing, printing, or packaging.
Gib mir bitte ein Blatt Papier, ich muss mir etwas notieren.
Please give me a sheet of paper; I need to write something down.
The form of the noun gives a strong clue to the meaning. In the singular ('das Papier' — paper), it usually means the material. In the plural ('die Papiere' — papers/documents), it almost always refers to official documents or securities.
Für den Drucker brauchen wir neues Papier.
We need new paper for the printer.
'Papier' (paper) is the base word for many useful compound nouns that describe a specific type of paper. Examples are 'Geschenkpapier' (wrapping paper), 'Backpapier' (baking/parchment paper), 'Schleifpapier' (sandpaper), or 'Toilettenpapier' (toilet paper).
Ich muss noch Geschenkpapier für das Geburtstagsgeschenk kaufen.
I still need to buy wrapping paper for the birthday present.
The idiom 'etwas zu Papier bringen' means to write down one's thoughts, a story, or an idea. It is often used to emphasize the process of writing.
Nach langer Überlegung hat er seine Ideen endlich zu Papier gebracht.
After a long time thinking, he finally put his ideas down on paper.
In the meaning of 'documents', 'Papiere' (papers/documents) is often used with verbs like 'vorzeigen' (to show/present), 'prüfen' (to check), or 'beantragen' (to apply for). It often involves IDs or vehicle documents.
Bei der Verkehrskontrolle musste der Fahrer seine Papiere vorzeigen.
During the traffic stop, the driver had to show his papers.
When 'Papiere' (securities) is mentioned in the context of money, the stock market, investments, or banks, it means securities. Watch for signal words like 'investieren' (to invest), 'Anleihe' (bond), 'Aktie' (stock/share), or 'Depot' (securities account/portfolio).
Der Berater empfahl ihm, in festverzinsliche Papiere zu investieren.
The advisor recommended that he invest in fixed-interest securities.
leaf / sheet
'das Papier' and 'das Blatt' can both have to do with the material used for writing or printing. 'Papier' usually means the material in general: you can buy, cut, or print on paper. 'Blatt' means a single sheet of paper, for example from a notebook, pad, or printer. Learners may confuse the words because a sheet is often made of paper. The simple rule is: if you are talking about the material, 'Papier' fits. If you mean a single piece, 'Blatt' fits better.
Im Büro ist kein Papier mehr im Drucker.
There is no paper left in the printer at the office.
Tom legt ein leeres Blatt auf den Tisch und beginnt zu zeichnen.
Tom puts a blank sheet on the table and starts drawing.