Authalic projection is a method of mapping a sphere onto a two-dimensional plane. This process is also known as equal area projection and is commonly used in cartography to create maps that maintain the correct size and proportion of map elements. There are several synonyms for this term, including conformal projection, equivalent projection, and equal-area projection. These terms refer to the same concept of preserving the size and shape of geographic features as they appear on a globe or sphere when they are projected onto a map. Other related terms include azimuthal projection, which preserves direction but distorts distance, and cylindrical projection, which preserves distance but distorts direction.