Windows 10 updates will be divided into C, B, and D levels

According to Microsoft, updates to Windows 10 will be divided into three categories, B, C, and D (without A), and each version will be released once a month. These are called "quality updates" (quality update), unlike the big 'feature updates' that are usually released every 6 months like October 2018 Update and 19H1.

Quality updates have a "cumulative" feature, so the following updates contain all patches from previous updates, which means that when you install the December update, you don't just have security patches since December but also everything else in October and November updates, though you have never installed them before.

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Update B: Patch Tuesday

Updates B are major updates that are usually released by Microsoft on the second Tuesday of the month, called "Patch Tuesday". Updates are usually not released in the first week of each month and this is why there are no updates A.

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Updates B are the most important updates, not only contain new security patches, but also contain previously released security patches in versions B, C, and D.

Update C and D: updates "optional" preview

C and D updates do not include any new security updates, only include new patches and non-security improvements. They will in turn be released in the 3rd and 4th week of the month.

Updates C and D are "optional" so they will not be automatically installed on your PC via Windows Update.

According to Microsoft, the D update is mostly non-security updates and is usually released to users for testing before being widely flattened in the next B update. C updates are often released to give people more time to test them.

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Although Windows Update does not automatically install C and D updates on most PCs, when users click on the "Check for Updates" button, they will turn themselves into test users of these updates. Therefore, Microsoft recently issued a warning to users about clicking Check for Updates.

If you never press "Check for Updates", users will only receive the tested B updates.

"Exception" updates

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These are emergency updates released when a major security error is detected, which needs to be patched immediately. The next cumulative update also contains patches in exception updates.

Feature updates

These major updates are released every 6 months. Basically, this is a completely new version of Windows 10.

See more:

1. Microsoft claims that deleting the data of Windows 10 October 2018 update will never happen again
2. Windows 10 collects and sends your activity history to Microsoft
3. Microsoft developed Windows 10 Lite operating system, a small version that actually runs on mobile chips