The technology typically used for building APIs (Application Programming Interfaces) includes REST (Representational State Transfer) and GraphQL. REST APIs rely on HTTP requests to manage data, offering a stateless communication protocol that simplifies interactions between client and server. In contrast, GraphQL provides a more flexible alternative that allows clients to request only the data they need, reducing over-fetching. Both technologies support integration between different platforms and services, enabling developers to expand functionality and reach within software applications. They are crucial in creating scalable and efficient systems.