Exceptions are things you can create/throw yourself or that might be thrown because of an obvious run-time error such as trying to access a null object or reading an array out of bounds. They can also be caught and repaired by a developer.
Errors should never be created, thrown, caught, or repaired. They are usually beyond the scope of your application code such as 'out of memory'. Even if you caught an out of memory error, you wouldn't likely be in a better place than the system garbage collector to fix this (and you'd have to fix it while allocating no new memory) so its better to let the system crash and repair the root cause.
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