BigObjects let you store and manage large amounts of data on the Salesforce platform.
Within Force.com, objects are used to store and access data. Different kinds of objects are provided with different capabilities to align with different use cases. Standard Objects store data as defined by Salesforce while Custom Objects are created to store information unique to your organization. External Objects are provided to connect to data that is stored outside of your Salesforce organization.

To create a BigObject

1. Go to Create –> BigObjects.

2. Click New.

1. BigObject can be exposed to REST, SOAP, BULK and MetaData APIs.

2. Supports Synchronous and Asynchronous SOQLs.

3. Reports and Dashboards are possible.

4. Search is not supported.

5. Supports aggregate function in the query.