Lets you remap a scalar parameter expressed in an old min/max range to a new min/max range.
Example: Let's say you want to remap the Z depth of a parameter, which currently varies from 0 to 1 000 000. You can use this node to remap these values to fall within a range of 0 to 1. Whenever the input exceeds the old min/max range, the remapped output is extrapolated linearly.