Droids are an everyday part of life in the Star Wars universe. They come in all shapes, sizes and colors, and perform about as many functions as any living creature. If there is a repetitive or dangerous task that a sentient creature could perform, there is a model of droid designed to do that very thing. However, droids are not mere automatons - some of them are so advanced that they seem "alive."
The droids of Star Wars: The Old Republic are more or less the same as droids from any other known era. In some cases, they seem much more advanced than the droids of 3600 years later (the era of the movies), and in other cases, less advanced or unchanged.
Find out where they all come from with Lore of the Old Republic: Droids.