What is the primary purpose of ArcGIS Online?

The primary purpose of ArcGIS Online is to serve as a cloud-based mapping and analysis platform. This platform allows users to create, share, and analyze geographic data and maps over the internet. ArcGIS Online facilitates collaboration among users by providing tools to visualize spatial data, perform analyses, and generate insights that can be shared across organizations and with the public.

The functionality of ArcGIS Online extends beyond simple mapping; it integrates various GIS capabilities, enabling users to leverage advanced geospatial analysis tools. Through this platform, users can access a variety of datasets, make use of templates for creating maps and applications, and utilize the extensive library of web maps and services available in the Esri ecosystem.

In contrast, the other options do not accurately describe the primary purpose of ArcGIS Online. It is not a social media platform, nor is it limited to desktop software or a local file storage service, which emphasizes the unique and specialized capabilities of ArcGIS Online in the realm of GIS and spatial analysis.