And steampunk is a style where modern technology is made to look old, for the most part Victorian and/or steam era, though something can be roughly WWII era and will sometimes be called steampunk. It's about making technology look as though it had a golden age. Think about Old radios and TVs that had ornate brass trim and real wood casings, but applied to computers and such. Steampunk has heavy emphasis on leather, gears/cogs, nixie tubes, brass, real wood, toggle switches, ornate text. Technology built to last,; totally functional but also beautiful to look at.
Sorry, I've got a special fondness for steampunk. That's what happens when you love both history and sci-fi/geek stuff.