Description: Interactivity in multimodal systems refers to the degree to which users can interact with platforms that integrate multiple modes of communication, such as text, voice, gestures, and graphics. This interactivity allows for a richer and more dynamic experience, as users can choose the mode that best suits their needs or preferences at any given moment. Multimodal systems are particularly relevant in the context of current technology, where the convergence of different forms of interaction has become essential to enhance usability and accessibility. The main characteristics of interactivity in these systems include real-time responsiveness, user experience personalization, and the integration of different communication channels. This not only improves interaction efficiency but also fosters greater user satisfaction by allowing them to engage more naturally and fluidly. Interactivity in multimodal systems is fundamental in applications such as virtual assistants, advanced user interfaces, and augmented reality environments, where the combination of various input and output modes can transform how users interact with technology.