Mitochondrial refers to anything related to mitochondria, which are small organelles found in the cells of most living organisms. Often called the "powerhouses" of the cell, mitochondria are responsible for producing energy in the form of adenosine triphosphate (ATP) through a process called cellular respiration. They play a crucial role in converting nutrients from food into usable energy. Mitochondria have their own DNA, which is distinct from the nuclear DNA found in the cell's nucleus. This unique DNA is inherited maternally, meaning it is passed down from mother to offspring. Mitochondrial function is essential for overall health, and dysfunction can lead to various diseases, including some forms of mitochondrial disorders.