e^x - 1

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Asking here because I have a math question but Google doesn't have an answer/I don't know how to search for this.

I was looking through some source code and found the following line of Java code:

x = Math.exp(x) - 1;

Where Math.exp(x) returns e^x. The documentation of the code refers to this as "converting the logarithmic vector into a linear form". I've been out of college for 6 years and I only know at a high-level how euler's number works, but I don't understand how this description fits.

Can someone explain to a retard like me, or point me toward a resource explaining, how raising e^x - 1 "converts a logarithmic vector into a linear form"?