Final answer:
The Olmecs were an ancient Mesoamerican civilization known for their art and architecture. They did not have a writing system, but heavily influenced later civilizations.
Step-by-step explanation:
The Olmecs were an ancient civilization that emerged in Mesoamerica around 1200 BCE.
They were known for their major works of art, architecture, pottery, and sculpture, including their famous giant head sculptures and the pyramid in La Venta.
The Olmecs did not have a writing system, but their culture and ideas influenced later Mesoamerican civilizations, such as the Maya and the Aztecs.