Conceptual art is an art movement that emphasizes ideas and concepts over traditional aesthetic and material concerns. It emerged in the 1960s and often challenges the conventional definitions of art by focusing on the message or concept behind the work rather than its visual appearance. Artists like Marcel Duchamp and Sol LeWitt are known for their contributions to this movement, using everyday objects and simple instructions to provoke thought and discussion. Conceptual art can take many forms, including installations, performances, and written texts, encouraging viewers to engage with the underlying ideas rather than just the artwork itself.