Equiareal projections are map projections that preserve surface area. Some synonyms for equiareal projections include equal-area projections, equivalent projections, and area-preserving projections. Equiareal projections are used in cartography and geography to accurately represent the surface of the Earth on a two-dimensional map. These projections are particularly useful for studying population density, understanding the distribution of resources, and analyzing climate patterns. Some popular types of equiareal projections include the Lambert azimuthal equal-area projection, the Mollweide projection, and the sinusoidal projection. These projections all maintain accurate surface area, but may distort other aspects such as shapes and distances.