In more detail
It is popular for hiding faces or text, but pixelation and blur can sometimes be partly reversed by software, especially for small text. To redact something properly, cover it with a solid opaque box and save a flattened copy.
Glossary
Design & Media
Pixelation
Pixelation replaces blocks of pixels with a single average colour, producing a coarse mosaic effect.
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See also
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Glossary
Brightness, contrast and grayscale
Brightness shifts every pixel lighter or darker, contrast spreads the light and dark values apart, and grayscale removes colour.
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Glossary
Metadata
Metadata is data about data: the hidden or secondary information a file carries about itself, such as its author, creation date.