Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Holes in the Heart ?
    ### Response:
    Holes in the heart are simple congenital (kon-JEN-ih-tal) heart defects. Congenital heart defects are problems with the heart's structure that are present at birth. These defects change the normal flow of blood through the heart.
                
The heart has two sides, separated by an inner wall called the septum.
    