What is a "pipe" file?
<p>My python script which uses multiprocessing is throwing an OSError because there are too many files.  I used the lsof command to list all of my files, and a lot of the entries look like</p>

<p><code>python   3647  username   87r     FIFO     0,10      0t0 18562471 pipe</code></p>

<p>Can you tell me how to interpret this?  What is a "pipe" file?</p>