A portal is a gateway that you and your organization can use to access, manage, and share geographic content, applications, tools, and services. Portals also provide a secure and effective way to manage all of your
content, e.g. web maps, layers, and service proxies, for your applications. ArcGIS Online is a portal hosted by Esri that you can use to search for geographic content and store your content in the cloud, alternatively, you can create your own portal by implementing ArcGIS Enterprise within your own infrastructure.