die Schulferien
school holidays
The period during which no classes take place at schools; time off from school.
In den Schulferien fahren viele Familien in den Urlaub.
During the school holidays, many families go on vacation.

school holidays
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school holidays
The period during which no classes take place at schools; time off from school.
In den Schulferien fahren viele Familien in den Urlaub.
During the school holidays, many families go on vacation.

The word is made up of 'Schul-' (school) and 'Ferien' (holidays). It therefore refers to the holidays associated with the institution of school.
Die nächsten Schulferien beginnen in zwei Wochen.
The next school holidays begin in two weeks.
The word 'Schulferien' (school holidays) is used almost exclusively in the plural, because it refers to a longer period of several days or weeks. A singular form is unusual.
Was machst du in den Sommerferien?
What are you doing during the summer holidays?
To indicate a period of time, you use the preposition 'in' with the dative: 'in den Schulferien' (during the school holidays). When talking about the holidays as a destination of anticipation, you use 'auf' with the accusative: 'sich auf die Schulferien freuen' (to look forward to the school holidays).
In den Schulferien habe ich meine Großeltern besucht.
During the school holidays, I visited my grandparents.
In Germany, the dates for the school holidays are set by the individual federal states. The summer holidays in particular therefore take place at different times in order to reduce travel traffic.
Wenn in Bayern noch Schule ist, haben die Kinder in Berlin schon Schulferien.
While school is still in session in Bavaria, the children in Berlin already have school holidays.
vacation / leave
'der Urlaub' and 'die Schulferien' both have to do with free time. 'Urlaub' is personal time off, especially from work, that you take or are granted. 'Schulferien' are fixed periods when there are no classes at schools. Children then have time off from school, and families often go on vacation during this time. The words can be confused because vacations often take place during the school holidays. Still, 'Schulferien' are the school's break period, while 'Urlaub' is personal time off or a trip.

Wegen der Schulferien sind viele Züge im Sommer sehr voll.
Because of the school holidays, many trains are very full in summer.
Heute buche ich den Urlaub für die letzte Juliwoche.
Today I am booking the vacation for the last week of July.