What does 'Sleep 600' do?

I see 'Sleep 600' when I run 'top'. What is it?

Hey tmomas. Thanks. I guess to clarify my question, why does the default installation of LEDE use the command? I assume it is a timer to do something every 10 minutes, but what might that be? I can't figure it out from the 'top' command.

"Sleep 600" PPID (=parent PID) = 29909
29909 is ddns update (marked with stars)
You should see similar in your top.

Mem: 31856K used, 29212K free, 1412K shrd, 2228K buff, 10880K cached
CPU:   0% usr   0% sys   0% nic  99% idle   0% io   0% irq   0% sirq
Load average: 0.00 0.01 0.05 2/46 23994
  PID  **PPID** USER     STAT   VSZ %VSZ %CPU COMMAND
23994 23989 root     R     1364   2%   1% top
  818     1 root     S     1568   3%   0% /sbin/netifd
 **29909**     1 root     S     1500   2%   0% {dynamic_dns_upd} /bin/sh /usr/lib/dd
 23987 **29909** root     S     1352   2%   0% sleep 600
23988   873 root     S     1220   2%   0% /usr/sbin/dropbear -F -P /var/run/dro
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Cool. Thanks. I learned a little nugget of goodness.