  This article, produced as part of an undergraduate research class, aims to
provide an overview of gravitational waves, though it does not offer a
comprehensive review. We begin with a brief discussion regarding the history of
gravitational waves, beginning even before Albert Einstein's theory of general
relativity, highlighting important developments and milestones in the field. We
then discuss the scientific significance of gravitational wave detections such
as the verification of general relativity and key properties of black
holes/neutron stars. We extend our analysis into various detection techniques
including interferometer-based detectors (LIGO, Virgo, GEO600), pulsar timing
arrays, and proposed space-based detectors (LISA, DECIGO, BBO). Finally, we
conclude our review with a brief examination of the captivating event GW190521.
