Dart is a client-optimized language for fast apps on any platform, developed by Google to build mobile, desktop, backend, and web applications. Dart code is easy to write without hassle with memory management and build systems. Twilio's Programmable SMS API makes sending and receiving SMS easy, allowing developers to create tools for the command line on macOS, Windows, or Linux. The my_twilio package structure includes a pubspec.yaml file, a lib folder containing src files, an example directory, and a main.dart file that uses the package to send text messages via Twilio's API. The package can be used in other Dart projects by adding it as a dependency in the pubspec.yaml file. A standalone executable version of the package can be created using dart2native, which takes arguments such as --from, --to, and --body to customize the message. The my_twilio package provides a simple way for developers to send text messages via Twilio's API from Dart code.