There is sometimes confusion between the communication techniques used with deafness versus blindness, especially with understanding what Braille is and who uses it. It's not uncommon to tell someone you know sign language and then they ask if you know Braille.
Braille is typically not used by deaf or hard of hearing individuals. It is a written language used by the blind and visually impaired who may have a hard time, or be unable to read written text. Braille uses patterns of raised dots to represent the characters of words. Instead of using sight to read text, the fingertips are used to feel the pattern of the raised dots to read Braille.
Similar to how there are different types of sign language, there are different versions of Braille. The United States uses English Braille. Even within English Braille there are different levels of encoding, similar to how there are different reading levels for English text.
Braille usage has declined because of the increased availability and use of screen reading software. However, braille education remains important for developing reading skills — in addition to physical books and other texts. Braille is found in all types of locations from signs in public areas to the panels in elevators. For example, see the Braille under the number 12 located next to the elevator button in the photo.
For more information on Braille, see the Braille Wikipedia page. We also have a previous Signing Savvy blog article, The mysterious confusion between deafness and blindness, that you may find interesting.