Security Updates are released for protecting the customers who use the software. There may be security vulnerabilities or errors in the software. If a hacker finds out these problems, they can make use of it. These updates correct the problems so that you can be safe. It also removes certain bugs that are preventing you from doing a certain task.
If the SharePoint Products and Technologies Configuration Wizard does not finish its task, SharePoint may be left in an inconsistent state. You may be unable to browse the Central Administration or SharePoint site. The update solves this issue.
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