Author/Source: Zero-day means a security problem that’s unknown to the software maker. A patch is a fix for a problem in a computer program. See the full link here
Takeaway
This article is about a problem in Microsoft Office that hackers could use to take control of computers. Microsoft released a fix for this problem, and people who use Office should install it right away.
Technical Subject Understandability
Beginner
Analogy/Comparison
Think of your computer programs like doors in your house. This Microsoft Office problem was like a broken lock on one of those doors, and the update is like getting a new, stronger lock.
Why It Matters
If you don’t fix this problem, someone could break into your computer and steal your information or cause other problems. For example, hackers could access sensitive business documents or personal emails if the flaw isn’t patched.
Related Terms
Zero-day, patch
Tech Teacher 
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