Braille was created by Louis Braille who was French, he lost his sight after an accident when he was very young. At fifteen he had developed his code for the entire French alphabet which he had ('based on a tactile military code called night writing, developed by Charles Barbier in response to Napoleon's demand for a means for soldiers to communicate silently at night and without light') , which was in 1824 and was a great improvement to the then current sight impairment enabler 'night writing'. Braille is not a language, it is simply a different form of communication for those with sight impairments.
How it works is, it's a series of raised dots that can be read with the fingers by people who are blind or whose eyesight is not sufficient for reading printed material. Braille is used very often in everyday life of a person who has a sight impairment. It is also read by teachers, parents and others who are not actually visually impaired, whom use their eyes to do so. It's a code by which many languages such as English, Spanish, French etcetera may be written and read. Braille was then published and ever since then has been improved over the years so that it can have even more uses and be used in various other ways.
Braille is used in all manor's of ways in healthcare settings, hospitals are the main places Braille is widely used, it's used on elevator buttons, doors, hospital layout maps, the sings on ward doors, the bathrooms, it's always on the backs of medicine bottles and packaging, it's on the hand sanitizer bottles, it's on the fire safety procedure notices, general notices and notice boards and various other things. In care homes you will also find Braille everywhere, on the signs, notices, doors, etcetera. Braille greatly benefits those who have visual impairment in health and social because people can now fully understand what his happening, find their way around hospitals a lot easier etc.