What is the show "The X-Files" about?

The X-Files is a science fiction show, featuring characters Special Agents Fox Mulder and Dana Scully who are investigating unsolved, mysterious cases called "X-Files." The show explores cases relating to the paranormal, such as Bigfoot and vampires, in standalone episodes referenced as "monster of the week" episodes, but also has a larger, ongoing storyline about the deeper conspiracies surrounding the existence of extraterrestrial life and government coverups which make up the "mytharc" (mythology story arc) of the show.