This is the 3354th most frequent Polish word.
wgląd
Insight.
Here, 'wgląd' is used in a metaphorical sense to describe gaining deeper understanding or insight into a subject.
Ta książka daje wgląd w historię średniowiecznej Europy.
This book provides insight into the history of medieval Europe.
In this context, 'wgląd' indicates having the opportunity or permission to examine or look at something.
Po wypadku policja miała wgląd w monitoringi miejskie.
After the accident, the police had access to city surveillance footage.
'Wgląd' here is about obtaining a deeper comprehension or examination of a scientific subject.