One of those weird aliens seen in the Star Trek: The Next Generation episode 11001001 who needed to backup their main computer into the Enterprise's database so they could upgrade it. They communicate with each other in a completely unintelligible language... binary perhaps? At any rate, they were never heard from again. They did some mean holodeck upgrades though, making the characters much more intelligent and realistic.
Come to think of it, the Bynars are responsible for the multitude of holodeck-related plots seen on TNG and Voyager. If they hadn't made the improvements, holographic characters wouldn't have taken over the ship every time some Data wanted to play detective games.
Sometimes misspelled "binar."