Multimodal AI refers to models that can understand and generate across multiple data modalities — not just text but also images, audio, video, and code. Models like GPT-4o, Gemini, and Claude are multimodal, enabling capabilities such as analyzing uploaded images, describing visual content, interpreting charts, and processing audio. In marketing, multimodal AI enables richer content analysis, automated image alt text generation, visual asset review, and more comprehensive content creation workflows.