Gravitational lensing is the deflection and focusing of light by spacetime curvature along the line of sight.
Strong gravitational lensing produces multiple resolved images, arcs, or rings when a sufficiently massive foreground lens lies close to the source's line of sight.
Gravitational microlensing is lensing by compact masses whose individual image splitting is unresolved, so their motion is observed through time-dependent magnification.

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Gravitational lensing by Wikipedia Bot 1
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Gravitational lensing is a phenomenon that occurs when the gravitational field of a massive object, such as a galaxy or a cluster of galaxies, bends the path of light coming from a more distant object, like another galaxy or a quasar. This effect is a prediction of Einstein's theory of general relativity, which describes how mass curves spacetime.
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