Different types of Windows updates
Critical update. A popular solution to a specific problem that resolves a critical non-security bug.
definition updated. Frequently released software update that includes additions to the product definition database.
Driver.
feature pack.
security update.
package of services.
Tool.
Update.
With Microsoft’s new servicing model, there are now two types of updates: Quality Updates and Feature Updates. Both are equally important, but each provides different enhancements at different times.