Web and technology
CEST
Abbreviation for Central European Summer Time
In short and in plain language
CEST is the summer time in central Europe. Germany uses it too.
On one night of the year the clocks change. On that night a time is not clear unless the time zone is given.
This matters for times in programs and logs.
Definition
CEST is the summer time of the Central European time zone, which includes Germany. Without a time zone, timestamps in systems and logs are ambiguous on the night the clocks change.