Chapter 4

1. An API is an Application Programming Interface, which allows the functionality of a program to be accessed from external sources.
2. axios is a promise-based library, whereas HTTP is callback-based.
3. Using try/catch and the to function method.
4. this.attributes.colour = colour.
5. Currently, only strings are allowed to be stored on session attributes.
6. You would use SSML to change the way that Alexa says something. This can be changing tone, emphasis, adding pauses, or a few other changes.