bool is the Dart type that represents a boolean value. It can be true or false.

// assign directly
bool isPortland = true;
bool isWinter = true;
// You can combine booleans with &&, ||, and other symbols
// if isPortland is true AND isWinter is true
bool isRaining = isPortland && isWinter;
if (isRaining) {
  print("Grab an umbrella!");
} else {
  print("The sun is shining!");
}
// prints
"Grab an umbrella!"