der Peak
peak
The highest point, peak value, or climax of a development, process, or performance.
Die Grippewelle hat in dieser Woche ihren Peak erreicht.
The flu wave reached its peak this week.

peak
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peak
The highest point, peak value, or climax of a development, process, or performance.
Die Grippewelle hat in dieser Woche ihren Peak erreicht.
The flu wave reached its peak this week.

'Peak' is an English loanword (Anglicism) that is very common in modern German colloquial and media language. In very formal or traditional texts, it is sometimes avoided.
Die Nutzung der App erreicht ihren Peak immer am Wochenende.
Use of the app always reaches its peak on the weekend.
Common verbs used with 'Peak' (peak) are 'erreichen' (to reach), 'überschreiten' (to exceed), or 'hinter sich haben' (to have behind one). The expression 'auf dem Peak sein' (to be at the peak) is also common.
Die Verkaufszahlen haben letzte Woche ihren Peak erreicht.
The sales figures reached their peak last week.
'Peak' (peak) is often used to describe the high point of developments that can be measured or observed. Examples include the peak of a wave of illness, a heat wave, a career, or workload.
Während der Prüfungsphase erreicht der Stress bei den Studierenden seinen Peak.
During the exam period, students' stress reaches its peak.
tip / top / lace
'die Spitze' and 'der Peak' can both mean the highest point of something. In German, 'die Spitze' is more general and works well for rankings, groups, or hierarchies, for example at the top of a company or table. 'der Peak' sounds more modern and is often used when talking about numbers, data, performance, or a development. Learners may confuse the words because both have to do with a 'highest point'. As a practical rule: for a position, you are more likely to say 'Spitze'; for a maximum value in a curve or development, 'Peak' is more likely.

Der Peak der Besucherzahlen war am Samstagabend.
The peak in visitor numbers was on Saturday evening.
Nach dem letzten Spiel steht die Mannschaft wieder an der Spitze der Tabelle.
After the last game, the team is back at the top of the table.