When do you need to use the Streaming API in Salesforce?

The Streaming API in Salesforce is specifically designed for scenarios that require real-time data processing. This functionality enables users to receive updates immediately when changes occur in the data, which is crucial for applications that demand timely information, such as dashboards, mobile apps, or other integrations that rely on current data state.

For example, when a record is updated in Salesforce, users can subscribe to changes and receive notifications through the Streaming API, allowing for instantaneous processing and responses in their applications. This capability is essential in cases where waiting for batch updates would lead to a lag in data accuracy or service responsiveness.

The other options, while related to data in some form, do not utilize the Streaming API for their core functions. Generating reports typically involves querying and aggregating data that does not necessitate real-time updates. High volumes of data require batch processing, which is better served by Bulk API or other batch mechanisms. Managing user sessions relates more to authentication and user management, rather than the real-time update capabilities offered by the Streaming API.