The document discusses techniques used to create atmosphere and suspense in horror films. It describes how darkness can be used to draw attention to certain objects or areas, or leave the audience guessing about what is happening. A known antagonist can also create tension as the audience knows the character is in danger. Sudden movements are effective at scaring viewers when there is little other action. Settings like isolated houses and graveyards, as well as unsettling sounds and discordant music, further build an eerie atmosphere and suspense.