Yeah, that's the right one. More "officially", http://yakuake.kde.org/ leads you through some links until you finally get to its KDE-Apps page at http://kde-apps.org/content/show.php?content=29153. But you'd probably just get it from your distro's package repository, anyway. For instance, I'm on Debian right now, and the package description does the elaboration for me, so:
$ apt-cache show yakuake | grep -A7 -m1 "Description:"
Description: a Quake-style terminal emulator based on KDE Konsole technology
YaKuake is inspired from the terminal in the Quake game: when you press a key
(by default F12, but that can be changed) a terminal window slides down from
the top of the screen. Press the key again, and the terminal slides back.
.
It is faster than a keyboard shortcut because it is already loaded into memory
and as such is very useful to anyone who frequently finds themselves switching
in and out of terminal sessions.
