The "Edda" refers to two important collections of Old Norse literature from medieval Iceland, known as the Poetic Edda and the Prose Edda. The Poetic Edda is a compilation of ancient poems that explore Norse mythology and heroic legends, while the Prose Edda, written by Snorri Sturluson in the 13th century, serves as a guide to these myths and includes stories about gods like Odin and Thor. Both Eddas are crucial for understanding Norse culture and mythology, providing insights into the beliefs, values, and traditions of the Viking Age. They have influenced modern literature, art, and popular culture, including works like J.R.R. Tolkien's "The Lord of the Rings" and the Marvel Cinematic Universe.