What is the difference between VST and AU plugins?

VST (Virtual Studio Technology) and AU (Audio Units) are the two most common plugin formats used in digital audio workstations. The main difference lies in their compatibility with different operating systems. VST is primarily used on Windows systems, while AU is exclusive to Apple's macOS and iOS. However, the distinction is becoming less significant as many DAWs now support both formats. Another difference lies in their graphical user interfaces. VST plugins typically have a standardized UI, allowing for consistency across different DAWs. On the other hand, AU plugins offer more flexibility in terms of UI customization, enabling developers to create unique and visually appealing interfaces. Functionally, VST and AU plugins are very similar, providing various instruments, effects, and tools for music production. They both allow users to enhance their creativity and expand the capabilities of their DAWs, regardless of the format they choose.