Gravitational waves are ‘ripples’ in the fabric of space-time caused by some of the
Most violent and energetic processes in the Universe. Albert Einstein predicted
the existence of gravitational waves in 1916 in his general theory of relativity.

When an object accelerates, it creates ripples in space-time, just like a boat causes
ripples in a pond. These space-time ripples are gravitational waves.
They are caused by cataclysmic events that result in high-energy explosions,
Such as collision of black holes or neutron stars.

They are extremely weak and so are very difficult to detect.
Missions like LIGO (Laser Interferometer Gravitational–wave Observatory) helps
To spot gravitation waves, detecting small changes in the distances between
Objects at set distances.