To get started with API Builder, see the API Builder Getting Started.
Connectors are adaptors that allow you to read and write data to and from an external data source, such as Mobile Backend Services, MySQL, Salesforce, and MongoDB, or in server memory. You can either add an existing connector to your API Builder application or create one to interface with your custom data source.
Models provide a standardized interface for an API Builder application, which allows client applications to access data. Models are either provided by a connector, reduced or extended from an existing model, or composed of several models (composite models) using a left or an inner join operation.
APIs - Legacy are custom endpoints that allow you to access and execute custom operations on model data. Create an API if you want to execute an operation not exposed by the standardized interface.
Arrow Blocks - Legacy are filters that allow you to pre- or post-process data. Blocks are optional and can be used by either APIs or Models.