GPT-4 can be used for copywriting by crafting captivating ad copy, social media posts, and email campaigns tailored to different audiences. It can also generate content such as blog posts and whitepapers with improved coherence and creativity by synthesizing information from multiple sources. Additionally, GPT-4 can analyze marketing data and provide insights, act as a multilingual marketing tool by understanding various dialects, and power chatbots for customer interaction that understand emotions in text.