Although much of the instructional content that has been converted into Braille will take the form of a Braille book, increasingly people who are Braille users are utilizing a refreshable Braille display.
A refreshable Braille display or Braille terminal is an electro-mechanical device for displaying Braille characters, usually by means of raising dots through holes in a flat surface. Blind computer users, who cannot use a normal computer monitor, use it to read text output. Speech synthesizers are also commonly used for the same task, and a blind user may switch between the two systems or use both at the same time depending on circumstances. (Source Wikipedia).
Photo credit: Image licensed through Creative Commons by George Williams