An iceberg is a large mass of freshwater ice that has broken off from a glacier or ice shelf and floats in the ocean. Icebergs are typically found in polar regions, where they can vary in size from small chunks to massive structures. About 90% of an iceberg's volume is submerged underwater, making them difficult to see and navigate around. Icebergs can be classified into different types based on their shape and size. The most common types include tabular icebergs, which have flat tops and steep sides, and pinnacle icebergs, which have pointed peaks. Icebergs play a crucial role in the Earth's climate system by reflecting sunlight and influencing ocean currents.