Multimodal interfaces are systems that allow users to interact using multiple modes of communication, such as speech, touch, and gestures. This approach enhances user experience by accommodating different preferences and abilities, making technology more accessible and intuitive. For example, a smartphone can be operated through voice commands, touchscreen gestures, or physical buttons. These interfaces are increasingly used in various applications, including virtual assistants like Siri and Alexa, as well as in augmented reality and virtual reality environments. By integrating different input methods, multimodal interfaces can improve efficiency and user satisfaction, enabling more natural interactions with technology.