**Web Mercator** is a [[Map Projection|map projection]] used as the *de-facto* standard in most online map providers. It is a variant of the [[Mercator Projection]] that uses a spherical Earth instead of an ellipsoid, and uses the [[WGS84|WGS84]] coordinate system. Its [[EPSG Geodetic Parameter Dataset|EPSG]] code is `EPSG:3857`, although some others have been used historically.