to copy
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to copy
To create an exact duplicate of something, especially documents (photocopying) or digital data (files, texts).
Kannst du mir bitte diese zehn Seiten für das Meeting kopieren?
Could you please copy these ten pages for me for the meeting?
The noun for the verb 'kopieren' (to copy) is 'die Kopie' (the copy). A copy is the result of the copying process.
Ich brauche bitte eine Kopie von deinem Ausweis.
I need a copy of your ID, please.
The context reveals the meaning: In the office or on a computer, it is about duplicating documents or data. In a social context, it is about imitating behavior. In a school context, it usually means copying without permission.
Mein kleiner Bruder kopiert alles, was ich mache.
My little brother copies everything I do.
In the digital realm, the fixed expression 'kopieren und einfügen' (copy and paste) is very common for transferring text or files from one place to another.
Du kannst den Link einfach kopieren und in die E-Mail einfügen.
You can simply copy the link and paste it into the email.
When 'kopieren' (to copy) means 'abschreiben' (to copy from someone else's work), the preposition 'von' is often used to name the source. This meaning is colloquial.
Sie hat die Hausaufgaben von ihrer Freundin kopiert.
She copied the homework from her friend.
to burn
'brennen' and 'kopieren' can both mean that digital data is duplicated. 'kopieren' is the general word: you can copy files, texts, or documents to another location or another device. 'brennen' is more specific and means that data is written onto a CD or DVD. That is why, when creating a CD, you can say that you are 'brennen' files. For a USB stick, a hard drive, or a folder, you normally say 'kopieren'.
Der Mitarbeiter kopiert die Fotos auf den USB-Stick.
The employee copies the photos onto the USB stick.
Für den alten DVD-Player brenne ich den Film auf eine DVD.
For the old DVD player, I am burning the film onto a DVD.