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OverlayFS
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<p>OverlayFS is a <a href="/facts/Union_mount/ddBxp6zY">union mount</a> filesystem implementation for Linux. It combines multiple different underlying mount points into one, resulting in a single directory structure that contains underlying files and sub-directories from all sources. Common applications overlay a read/write partition over a read-only partition, such as with <a href="/facts/Live_CD/J4bpHUs1">LiveCDs</a> and <a href="/facts/IoT_device/rwwGAxn3">IoT devices</a> with limited flash memory write cycles. </p>