The Time Machine is a science fiction novella by H. G. Wells, published in 1895. Wells is generally credited with the popularization of the concept of time travel by using a vehicle that allows an operator to travel purposefully and selectively. The term "time machine," coined by Wells, is now almost universally used to refer to such a vehicle. The Time Machine has since been adapted into two feature films of the same name, as well as two television versions, and a large number of comic book adaptations. It has also indirectly inspired many more works of fiction in many media.