: This stands for Electronic Software Delivery. It's a method of delivering software (in this case, Windows 7) digitally, often through a direct download. ESD versions are typically used for retail versions of Windows that are purchased online and then downloaded directly to the customer's computer.
This indicates the build was updated with security rollups and patches up to March of that specific year, ensuring it is as secure as a legacy OS can be out of the box. The 11 Editions Included windows 7 sp1 x64 11in1 oem esd ptbr march 202 verified