Built-in functions in Dart are functionalities provided by the language itself, without needing to import additional libraries. Here are some of the most commonly used built-in functions in Dart:

1. print()

• Used to output data to the console.
• Example: print('Hello, Dart!');

2. assert()

• Used for debugging purposes. Throws an error if the given condition is false.
• Example: assert(x > 0);