— Debian package, originally from Debian. Used by Debian and
derivatives such as Ubuntu.
ebuild — the file
containing information on how to retrieve, compile, and install a
package in Gentoo's Portage system using the command emerge. Typically these are
source-primary installs, though binary packages can be installed in
this fashion as well. Gentoo-based distributions also use the
ebuild system from the same Portage tree.