What is AUTOSAR and why is it important for automotive software?

AUTomotive Open System ARchitecture (AUTOSAR) is a standardized software architecture enabling ECU software portability and reuse. It defines: Layered architecture separating application, runtime environment (RTE), and basic software (BSW), standardized interfaces between software components, methodology for system and software development, and communication templates. AUTOSAR reduces development cost by enabling multi-supplier collaboration, simplifies ECU integration, facilitates software updates, and enables separation of hardware and application concerns. Most major OEMs require AUTOSAR compliance.