wiki.archlinux.org/title/Solid_state_drive/NVMe

Namespaces are the construct in NVMe technology that hold user data. An NVMe controller can have multiple namespaces attached to it. Most NVMe SSDs today just use a single namespace, but multi-tenant applications, virtualization and security have use cases for multiple namespaces.

There are two types of people: Those who are able to identify gaps in their knowledge and actively seek to fill them… and whatever this meme is.