Web, domains and email
security update
In short and in plain language
A security update is a fix for software.
It closes gaps that are known. For a site, it covers the system, the add-ons and the server.
If updates are left undone, the risk grows. Then a site can be hacked or misused.
Definition
A security update is a software update that closes known security vulnerabilities. For websites it concerns the system, extensions and the server. If updates are left undone, the risk of a site being hacked or misused increases.