The Nether, often referred to as the Underworld, is a dimension in the popular video game Minecraft. It is a dark, fiery realm filled with unique biomes, such as the Crimson Forest and Soul Sand Valley. Players can access the Nether by building a Nether Portal using obsidian blocks and lighting it with flint and steel. In the Nether, players encounter various hostile mobs, including Ghasts and Blazes, as well as valuable resources like Nether Quartz and Glowstone. The environment is characterized by lava lakes and dangerous terrain, making exploration both challenging and rewarding for players seeking rare materials.