Which of the following best describes a feature layer in ArcGIS Online?

A feature layer in ArcGIS Online is best described as a collection of features that represent spatial information. This means that feature layers are designed to store and manage spatial data, which can include points, lines, and polygons that correspond to real-world objects or entities. These layers can contain attribute data associated with each feature, allowing users to analyze and visualize geographic relationships.

Feature layers are extremely versatile; they serve as the backbone for creating maps and applications in ArcGIS Online, enabling interactive features such as querying, editing, and styling based on specific attributes. This functionality empowers users to derive insights from geospatial data, making it a key component of spatial analysis and geographic visualization.

The other options, while they touch on aspects of data handling or visualization, do not accurately encompass the primary function of feature layers, which is fundamentally tied to the representation and manipulation of geographic features and associated data.