Software is one of those things that is never finished. In the open source world, we tend to be more honest about this fact than elsewhere; Linux and all the software running on it are in a constant state of change and improvement. At the same time, there are security issues. Again, the open source mentality makes for openness about the fact that these security issues exist and provides very rapid fixes.
For several years, SUSE has provided an online method of updating the system, which operates by collecting patch RPMs from a server and installing them through the YaST online update module. The beauty of patch RPMs is that they need to contain only the changed files from an RPM that has been updated, very significantly reducing the bandwidth involved in the update procedure.
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