Searching for an usually means you're looking to run this classic version of Android on a PC or a virtual machine (like VirtualBox or VMware).
Avoid logging into your primary Google account or using banking apps on KitKat, as it hasn't received security patches in years.
Many modern apps on the Play Store will no longer work on Android 4.4. You may need to hunt for older versions (APKs) from sites like APKMirror.
Are you planning to run this in a or are you trying to revive an old laptop ?