Salesforce offers a range of APIs that allow developers to integrate external applications with the Salesforce platform. These include SOAP, REST, Bulk, Streaming, and Metadata APIs. SOAP is a widely used protocol that enables integration with Salesforce, while REST provides a lightweight interface for easy integration. The Bulk API is designed for processing large volumes of data, and the Streaming API enables real-time data streaming. Lastly, the Metadata API is used to manage and deploy customizations and configurations in Salesforce. Each API offers different functionalities, making them suitable for various use cases and enabling seamless integration with Salesforce, providing developers with flexibility and customization options.