In House Turing, SDKs and libraries are used to make code more human-centered and easier to read, as they provide a way for developers to reuse packaged code and tools. Java offers internal libraries such as `java.util` and external libraries like Twilio's Java helper library, which can be integrated into projects to simplify the development process. Utilizing APIs is crucial in saving time and solving problems efficiently. The Twilio SDK provides a seamless integration with Twilio's products and services, allowing developers to create interactive web applications and make phone calls and send SMS. Additionally, libraries like JUnit 5 and Mockito can assist in finding bugs and practicing behavior-driven testing and test-driven development.