Main reasons of important role of HDL in modern design methodology

Design functionality can be verified early in the design process. Design simulation at this higher level, before implementation at the gate level, allows you to evaluate architectural and design decisions. Coupling HDL Compiler with logic synthesis tools, you can automatically convert an HDL description to a gate-level implementation in a target technology.HDL descriptions provide technology independent documentation of a design and its functionality. Since the initial HDL design description is technology-independent, you can use it again to generate the design in a different technology, without having to translate from the original technology.