Steam punk is a sub- genre. A mixture of science fiction, alternate history and speculative fiction. It involves and era where steam power is used, usually 19th century Victorian britain with aspects of science fiction and fantasy. Steampunk features anachronistic technology and futuristic innovations set with in Victorian fashion, architecture, art and culture.

For example this laptop;

It is a modern-day invention but it has been modified to look like it was from the Victorian era, an impossibility as laptops were not invented then.

Another example is this bluetooth headset;