What is the difference between monofocal and multifocal intraocular lenses?

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What is the difference between monofocal and multifocal intraocular lenses?
A monofocal intraocular lens is generally designed to focus at one distance. Multifocal lenses are designed to reduce reliance on glasses at multiple distances. However, some multifocal IOLs can cause halos or reduced contrast sensitivity, so they are not suitable for everyone.

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