New
#51
KB's are "changes". That's all, they don't imply improvement, they are a method of change control.
All patches to the OS, be they "hotfixes", Service packs, security updates, or even patches that remove functionality (like the one that removed gadgets from Windows 7) are KB's. KB's are actually the Knowledge Base articles that document the change, and the files are named after them.
Of the 4 or so KB's associated with the Windows 10 rollout, 3 of them I believe are updates that modify the OS to make upgrading easier by prepping the OS components to a certain level. The 4th one is the one that does the "notifications" which is what people seem to complain about. Regardless, 3 of them are perfectly fine and are just maintenance patches, and don't do anything you might not want. You are free to not install the 4th one (or any of them really) and to set your system to not install Recommended updates as important.