What is the Euro Code 9?

Could you elaborate on the Euro Code 9 and its significance in the realm of structural design? I'm particularly interested in understanding its purpose, scope of application, and any notable changes or updates it may have undergone in recent years. Given the importance of safety and efficiency in building design, I'm keen to grasp the key aspects of this code and how it's utilized by engineers and architects worldwide. Your insight into this matter would be greatly appreciated.