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Actually, what is a Freedesktop Portal?
(thelibre.news)
A community for everything relating to the GNU/Linux operating system
Also check out:
Original icon base courtesy of lewing@isc.tamu.edu and The GIMP
It's important to note that not all portals are implemented on all desktop environments. You can see this as a reference table: https://wiki.archlinux.org/title/XDG_Desktop_Portal#List_of_backends_and_interfaces
You also use the portal helper from another DE though.
For example, the Niri Wayland compositor, written in Rust with Smithay, uses xdg-desktop-portal-gnome (which I imagine is written in C).