BSB stands for "Bank State Branch." It is a six-digit code used in Australia to identify a specific bank and branch location for processing transactions. The code helps to route payments accurately within Australian banks and their branches, and it is commonly used for domestic money transfers in Australia.
Additionally, BSB can also stand for other things in different contexts, such as "British Sky Broadcasting" or "Bachelor of Science in Business," but the primary and most common meaning, especially related to banking, is Bank State Branch.