kernel32.dll
This file is not a system component: windows itself, not a download. Restore it from the source that installed it rather than downloading a replacement.
Do not download this DLL on its own
Searching for a missing DLL by name leads to sites that hand you that single file. It is one of the oldest and most effective malware delivery methods there is, and a system DLL from an unknown source is indistinguishable from a deliberately modified one. There is never a legitimate reason to obtain a runtime component that way.
What it is
One of the most fundamental components of Windows, providing memory management, process handling and file access. Every running program uses it.
Where you see it: Startup failures, "entry point not found" errors, and old software written for a much older Windows version.
If kernel32.dll were genuinely missing, Windows would not boot at all. These errors almost always mean either that a program is calling a function that does not exist in your Windows version, which no file replaces, or that system files are damaged. Run "sfc /scannow" and then "DISM /Online /Cleanup-Image /RestoreHealth" in an elevated terminal. Replacing kernel32.dll by hand is one of the most reliable ways to make a machine unbootable, and every site offering it is either careless or hostile.
Why there is nothing to download here
There is no verified download we can offer for this one, because installing a file is not the fix. The steps above are what actually resolves it. That distinction matters: the sites ranking for this file name are selling a download that would not have helped even if it were safe.