The answer is cross-sectional study. It is
a kind of observational study that examines data composed
from a populace, or an illustrative subset, at an exact point in time,
this is what you call cross-sectional data. Cross-sectional studies include
data gathered at a clear time. They are frequently used to measure the occurrence of
severe or long-lasting circumstances, or to a response in questions about the reasons
of illness or the consequences of interference.
