knistern
to crackle
To make a soft, dry, cracking or rustling sound. It is often associated with fire, dry leaves, or paper.
Das Kaminfeuer knisterte gemütlich vor sich hin.
The fire in the fireplace crackled cozily away.

to crackle
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to crackle
To make a soft, dry, cracking or rustling sound. It is often associated with fire, dry leaves, or paper.
Das Kaminfeuer knisterte gemütlich vor sich hin.
The fire in the fireplace crackled cozily away.

'Knistern' (to crackle) is an onomatopoeic word. It imitates the soft, dry sound it describes, for example from fire or dry leaves.
Das trockene Laub knisterte unter seinen Schritten.
The dry leaves crackled under his steps.
The sound 'knistern' (crackling) is typically produced by a fire in a fireplace, dry leaves, a paper bag, or even electrical tension.
Als sie die Bonbontüte öffnete, knisterte es leise.
When she opened the candy bag, it crackled softly.
In a figurative sense, 'knistern' (to crackle) describes a noticeable tension or excitement in the air, often between people. One signal for this is the preposition 'zwischen' (between).
Man konnte spüren, wie es zwischen den beiden Hauptdarstellern knisterte.
You could feel how the air crackled between the two lead actors.
In the figurative meaning, the impersonal pronoun 'es' is often used as the subject to express a general, intangible tension.
Vor der wichtigen Ankündigung knisterte es im ganzen Raum.
Before the important announcement, the whole room crackled with tension.
to crack
'knacken' and 'knistern' both describe sounds that can seem dry or hard. 'knacken' is a short, single, and clear sound, for example when a branch breaks or a joint moves. 'knistern' is softer and often lasts longer, with many small sounds in a row, for example with fire, dry leaves, or paper. The words can be confused because both sounds feel similarly dry. Remember: a single hard sound 'knackt'; many small soft sounds 'knistern'.

Im Kamin knistert das Feuer, während wir Tee trinken.
The fire is crackling in the fireplace while we drink tea.
Wenn Tom den Kopf dreht, knackt manchmal sein Nacken.
When Tom turns his head, his neck sometimes cracks.