What is data bus in microprocessor? All Questions › Category: Automotive Electronics › What is data bus in microprocessor? 0 Vote Up Vote Down chetan shidling asked 5 years ago I need short information 1 Answers 0 Vote Up Vote Down chetan shidling answered 5 years ago The data bus is used to carry information from one part of the processor or computer to another part. The data bus is generally of 4, 8, 16 and 32 bits wide.