Logo design involves creating a unique visual symbol that represents a brand, company, or organization. It typically embodies the essence, values, and identity of the entity. Posters, on the other hand, are graphic displays intended to convey a message or promote an event, product, or idea. They use images, text, and design elements to capture attention and communicate information effectively. Both require creative thinking, attention to detail, and an understanding of the target audience to be impactful.