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CheckoutOfficeSetup.exe /configure configuration.xml
Or for fully silent (no UI):
OfficeSetup.exe /configure silent-config.xml /quiet /norestart
setup.exe /configure config.xml
A Standard (Online) Installer is a small file (usually a few megabytes). When you run it, it connects to Microsoft servers, checks your system architecture, and streams the necessary files to your computer. If the internet cuts out, the installation fails.
An Offline Installer is a complete package (usually 2GB to 4GB or more). It contains every file, asset, and language pack needed for the software to run. Once downloaded, it requires zero internet connection to install the software on the target computer.