Multimodal Interaction refers to the combination of multiple modalities (e.g., touch, voice, gesture) in the user-interface design. It facilitates a more intuitive and flexible user experience, especially in environments where traditional interaction methods may be inconvenient.

For example, Apple's Siri or Amazon's Alexa offers both voice and touch as input methods. In a driving scenario, it's unsafe to type or touch, making voice commands indispensable. Beyond safety, it enhances user experience. For someone cooking with messy hands, voice commands to Alexa can set timers or play music without the need to wash hands and touch the device.

Moreover, with the rise of augmented reality (AR) devices like Microsoft's HoloLens, gestures become crucial. These AR glasses overlay virtual images on the real world, and gestures help in navigating and interacting with these holograms, making the experience immersive.

Multimodal interaction recognizes our diverse capabilities and preferences, ensuring a more inclusive and adaptive technological future.