Which of the following statements accurately describes the purpose of the "elif" keyword in Python's $"$if$-$elif$-$else" conditional structure?

A$.$ "elif" is used to define a new variable within the $"$if$"$ block.

B$.$ "elif" is used to terminate the program if a specific condition is met.

C$.$ "elif" is used to exit the current loop and continue with the next iteration.

D$.$ "elif" is used to specify the default case when no other conditions are met.

E$.$ "elif" is used to introduce an additional condition to be checked if the previous $"$if$"$ or "elif" conditions are False.