Explanation
A map is a type of component that enables users to view and manage data based on geographic locations. A map consists of a background map and spatial geometry objects that are sourced from data in a table or from a REST data source. Spatial geometry objects are shapes that represent real-world features on a map, such as points, lines, polygons, or heat maps. Three of the supported spatial geometry objects in Oracle APEX are:
Polygons: A polygon is a closed shape that consists of three or more vertices connected by straight line segments. A polygon can represent an area on a map, such as a country, a state, a city, or a building. A polygon can have different colors, patterns, or borders to indicate different attributes or categories of the data.
Heat map: A heat map is a type of visualization that uses color gradients to show the density or intensity of data values in a geographic area. A heat map can represent the distribution or variation of a numeric variable on a map, such as population, income, crime rate, or temperature.
Points: A point is a zero-dimensional shape that represents a single location on a map. A point can have different symbols, sizes, or colors to indicate different attributes or categories of the data. A point can also have a label or a tooltip to display additional information about the data.

Explanation
A REST Data Source is a logical representation of an external web service in Oracle APEX. It can contain one or many Operations, which are the references to a concrete external web service endpoint. Oracle APEX supports three types of REST Data Sources: REST Enabled SQL Query, Web Source Module, and Generic REST Data Source. Oracle APEX provides direct integration of REST Data Sources in interactive reports and grids, as well as other components. REST Data Sources can support various authentication methods, such as Basic, OAuth2, or Custom. References: [Understanding REST Data Sources] and [Creating a REST Data Source]