What is the process of simultaneously installing an operating system and a Service Pack called?

Synchronous Update is not a recognized technical term for merging a service pack into OS installation media.

Slipstreaming merges a service pack into the original OS installation source files, allowing the operating system and the service pack to be installed together in one operation without a separate post-install update step. This reduces deployment time and ensures the system is fully patched from first boot.

Simultaneous Update is not a defined term for this procedure and does not describe the concept of pre-integrating a service pack into the installation source.

Synchronizing refers to keeping data or systems aligned over time and does not describe merging a service pack into OS installation media.