To declare a List the syntax is

List<data-type> <variableName>=List();

Here data type can be any like integer String, Map or user-defined(Class) object like Student(), if you don’t mention any data type by default dynamic type is assigned that means any type of elements can be used in a List . Mentioning data type make sure only a particular data type items will be added, if you are not sure about the value which is coming in List then use dynamic datatype.

void main() {

List<String> movies=["Avengers","IronMan","Harry Potter-I","Harry Potter-II"];
print(movies);
print(movies.runtimeType);
  
List someData=["Avengers",2019,4.4,true];
print(someData);
print(someData.runtimeType);

}

OUTPUT

[Avengers, IronMan, Harry Potter-I, Harry Potter-II]
List<String>
[Avengers, 2019, 4.4, true]
List<dynamic>

variableName can be any name like studentList, favoriteMovies etc, and List() create a new empty list i.e that is at the start there will be no items in list length will be 0. if you want to declare a variable with some predefined items then you can use it like this:

List<String> movies=["Avengers","IronMan","Harry Potter-I","Harry Potter-II"];

You can also create an empty list by

List<data-type> <variableName>=[];