According to this article:
As you might know,
dynamic
(as it is now called) is the stand-in type when a static type annotation is not provide
Both in dynamic and var,the variable can hold data of any data type, i.e., int , float,string,etc
If a variable is declared as a dynamic and if even initialised, its type can change over time.Try this code in https://dartpad.dev/
void main() {
dynamic x = 'abc';
x = 12345;
print(x);
}
If you declare variable as a var, once assigned type can not change.
void main() {
var x = 'abc';
x = 12345;
print(x);
}
The above code will result in the error stating that A value of type 'int' can't be assigned to a variable of type 'String' - line 3
BUT, if you state a var without initializing, it becomes a dynamic:
void main() {
var x ;
x = 'abc';
x=12345;
print(x);
}