A snowflake is a frozen crystal of water that forms in the atmosphere when water vapor condenses and freezes. Their intricate and unique shapes are formed by the temperature and humidity conditions in which they are created. Snowflakes are typically hexagonal in shape, but can also come in a variety of other shapes. They are also incredibly small, with the average snowflake measuring only a few millimeters in diameter. Snowflakes are also known for their light and fluffy texture, which is due to their low density.