Technic rose to prominence as a mod-pack orientated for SSP users created by users from SomethingAwful; this was an important distinction, as before the release of Minecraft 1.3.2, a Minecraft Mod had to be specifically coded as either SSP (Survival Single Player) or SMP (Survival MultiPlayer).
Due to the changes to how the client operated in Minecraft 1.3.2 (making even clients operate as if they had a server), Technic was discontinued. While it can still be downloaded via the Technic Launcher, this will be discontinued as an option in the near future.