  The NA62 experiment at CERN targets the measurement of the ultra-rare $K^{+}
\to \pi^{+}\nu\bar{\nu}$ decay, and carries out a broad physics programme that
includes probes for symmetry violations and searches for exotic particles. Data
were collected in 2016-2018 using a multi-level trigger system, which is
described highlighting performance studies based on 2018 data.
