The most common method, which mimics an Original Equipment Manufacturer (OEM) BIOS signature to trick Windows into thinking it is on a licensed machine.
The term "pre-activated" means the ISO has been modified to bypass or automate the activation process.
Many include .NET Framework 4.8, DirectX, and Internet Explorer 11 pre-installed. Understanding "Pre-Activated" ISOs windows-7-ultimate-sp1-update-2021-preactivated-iso-gratis
The essential foundation for any modern Windows 7 installation.
If you must use Windows 7, it is safer to download an "untouched" official ISO and update it yourself: How to get updated windows 7 sp1 iso? The most common method, which mimics an Original
A full write-up on "pre-activated" ISOs involves understanding their composition, security risks, and the technical methods used to create them. What is a "2021 Update" ISO?
Official support for Windows 7 ended in January 2020. ISOs labeled "2021 Update" (or later) are rather than official Microsoft products. They typically include: What is a "2021 Update" ISO
Often used in "All-in-One" (AIO) versions, this uses a local service to manage activation.