Can someone describe the difference between left and right heart failure?

Heart failure can be separated into left heart failure which is due to either a weakness in the muscle, cardiomyopathy, or arterial disease either can weaken the ability of the heart to pump. Right heart failure is due to lung disease which weakens the heart, or due to congenital heart disease. Either cause can lead to pump failure, or failure of the heart to pump the blood that comes into it.