Multimodal interaction involves the use of multiple communication channels between the user and the machine, such as voice, gestures, and touch. This is enhanced in the realms of virtual reality (VR), augmented reality (AR), and extended reality (XR), where digital environments merge with the physical world to create immersive experiences. The metaverse, a virtual expansion of the real world, enables applications ranging from entertainment to education and professional collaboration. The application of generative artificial intelligence in this area opens the door to more natural and adaptive interactions and facilitates the creation of personalized content and experiences. This set of technologies not only redefines digital experiences but also opens up endless possibilities for applications across different sectors.