Bosch are German engineering and electronics manufacturer and at time of writing, the world’s largest supplier of automotive components.
Bosch supplied Volkswagen with many of the original equipment parts on the Mk2 Golf, most significantly the k-jetroinc (http://www.vwgolfmk2.co.uk/forum/viewtopic.php?f=147&t=45833) fuel injection system on the early 8v GTI and the 16v GTI.