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This is Debian 11, codenamed bullseye, netinst, for 64-bit PC (amd64) debian-11.5.0-amd64-netinst.iso.
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Debian installer ISOs are hybrid images, which means they can be written directly to CD/DVD/BD media OR to USB sticks.
Other Installers
Other installers and images, such as live systems, offline installers for systems without a network connection, installers for other CPU architectures, or cloud instances, can be found at Getting Debian.
Unofficial installers with non-free firmware, helpful for some network and video adapters, can be downloaded from Unofficial non-free images including firmware packages.