Commonly referred to as "Books" by people of the time, these objects were used by people as their source of reading before the eBook. Operated by turning pieces of paper that contained words written in actual ink. During this time people were inconvenienced by driving downtown and checking these materials out for free at a "Public Library," which was a place that loaned books out for a 2 week period.
It is a subgenre of psychological horror in which the use of analog equipment/technology is very present. It is usually located on youtube, and it's time period is usually in between 1960-1990, however some have used the early 2000s style