Multimodal AI is not just a theoretical idea; it is already integrated into many technologies used daily. These systems gain power and intuitiveness by understanding and processing information from various sources, similar to human cognitive processes. Common examples demonstrate multimodal AI in action.

The diagram below illustrates how different types of data, or modalities, can feed into a multimodal AI system, which then produces a variety of intelligent outputs or actions.

A simplified view of how a multimodal AI system takes in different types of data (modalities) and produces various forms of intelligent output.

Now, let's explore some specific applications.

Smart Assistants (e.g., Siri, Google Assistant, Alexa)

Modalities Involved: Primarily audio (your voice commands) and text (for internal processing and sometimes display). They can also use visual information if they operate on devices with screens (like your smartphone or a smart display).
How it Works (In Simple Terms): When you speak a command like, "Hey Google, what's the weather like today?", the assistant first converts your speech (audio) into text. Then, its AI brain figures out what you mean by analyzing this text. If you ask it about something on your screen, it might also consider that visual information. Finally, it usually gives you a spoken answer (audio) and might show information on the screen (text and images).
Why it's Multimodal & The Benefit: Combining audio with text, and sometimes vision, allows for a much more natural and flexible way to interact. It's closer to how you'd communicate with another person. You can speak, see results, and sometimes point or refer to things visually. This makes the assistant more helpful and easier to use.

Enhanced Search Engines (e.g., Google Search with Image Search)

Modalities Involved: Text (your typed search query), images (when you search using an image, or for images), and voice (if you use voice search). The search engine itself catalogs web pages containing text, images, and videos (which include both visual and audio information).
How it Works (In Simple Terms): If you type "cute puppy" (text), the search engine looks for web pages with that text and images that are tagged or understood to be about cute puppies. With features like Google Lens, you can upload an image of a plant (image), and the AI will try to identify it and then search for information (text) about that plant. It combines its understanding of your query modality with its index of multimodal web content.
Why it's Multimodal & The Benefit: By understanding and connecting different types of data, search engines can provide richer, more relevant results. You're not limited to just text queries; you can use the type of information that makes the most sense for your search, leading to better answers.

Social Media Content Understanding (e.g., Instagram, TikTok, YouTube)

Modalities Involved: Images, videos (which have visual and audio tracks), and text (captions, comments, hashtags).
How it Works (In Simple Terms): When someone posts a video of a concert (visuals of the band, audio of music and crowd) with a caption like "Amazing show last night! #LiveMusic" (text), the platform's AI can analyze all these pieces. It might identify the music genre from the audio, recognize faces or locations from the video, and understand the positive sentiment from the text.
Why it's Multimodal & The Benefit: This combined understanding helps social media platforms do many things: recommend content you might like (e.g., more concert videos), automatically generate captions for videos (making them accessible), or identify and filter out inappropriate content. Understanding the full context of a post requires looking at all its parts.

Image Captioning Systems

Modalities Involved: The input is an image. The output is text.
How it Works (In Simple Terms): An AI model for image captioning "looks" at an image, identifies the main objects (like "dog," "ball," "park"), their attributes ("brown dog," "red ball"), and the relationships or actions ("dog catching a ball"). It then generates a sentence that describes the scene, such as "A brown dog is catching a red ball in the park." This involves a sophisticated transformation of visual patterns into meaningful language.
Why it's Multimodal & The Benefit: This is a direct example of AI bridging vision and language. Benefits include making visual content accessible to people with visual impairments (via screen readers that read the captions), helping to organize and search large collections of photos, and providing descriptive alternatives for images on the web.

Visual Question Answering (VQA)

Modalities Involved: The inputs are an image and a text-based question about that image. The output is typically text (the answer).
How it Works (In Simple Terms): Imagine you show an AI a picture of a kitchen and ask, "What color is the refrigerator?" The VQA system needs to understand your question (text processing). Then, it must locate the refrigerator in the image and determine its color (image analysis). Finally, it formulates an answer, like "The refrigerator is silver."
Why it's Multimodal & The Benefit: VQA requires a tight integration of visual understanding and language comprehension. It allows for interactive exploration of visual scenes. Applications can range from educational tools where students ask questions about diagrams, to assistive technologies for navigating environments.

Recommendation Systems (e.g., Netflix, YouTube, Spotify)

Modalities Involved: These systems process the content itself: video (visual frames, motion), audio (dialogue, music, sound effects), text (titles, descriptions, subtitles, user reviews), and even images (cover art, thumbnails). They also consider your interaction data.
How it Works (In Simple Terms): When Netflix suggests a new show, it's not just looking at what genres you've watched. Its AI might analyze the actual content: the pacing of scenes in a thriller (from video), the type of humor in dialogue (from audio or subtitles), or the topics covered in a documentary (from text descriptions). It combines this content analysis with your viewing history (e.g., you often watch movies with a specific actor, identified from image/video analysis of cast).
Why it's Multimodal & The Benefit: By analyzing the rich information within the content itself, across different modalities, recommendation systems can move past simple genre tags or user ratings. This leads to more personalized and often accurate suggestions for what you might enjoy next, whether it's a movie, a song, or a product.

These examples highlight just a few ways multimodal AI is enhancing technology. As AI continues to advance, we'll see even more sophisticated systems that can understand and interact through multiple channels, much like we do.

Examples of Multimodal Systems