The primary ingredient in traditional chocolate cake is cocoa powder, which gives the cake its rich chocolate flavor. Along with flour, sugar, eggs, and butter, cocoa powder is mixed to create a moist and delicious dessert. Various recipes may include additional elements like baking powder for leavening and milk or vanilla extract for moisture and flavor. Chocolate cake is a staple in many celebrations, including birthdays and graduations, often adorned with chocolate frosting or ganache, highlighting its popularity as a cherished indulgence.