Is there a defragmenter in OS X?

just curious if os x has feature, i'm new mac system.

 

apparently no need one.

http://support.apple.com/kb/ht1375

more recent link http://speedup-mac.blogspot.com/2011/08/do-we-need-to-defrag-mac-lion-hard.html

 

Forums Macs macOS Older OS X Versions Mac OS X Lion (10.7)

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