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Cydia Substrate
Basic Info
Mobile Substrate is saurik's extension for SpringBoard that allows 3rd party SpringBoard addons to run. Examples include the Five Icon Dock and WinterBoard.
And with all this extra code...
As always, even with PCs, extra code means crashing and Mobile Substrate can solve this too. Should the SpringBoard crash for any reason (which is quite common once let loose on Cydia as there are a large number of SpringBoard extensions) Mobile Substrate will temporarily put the SpringBoard into Safe Mode with SpringBoard extensions disabled, so you can troubleshoot the problem.