Mitochondria and chloroplast are two organelles found in eukaryotic cells that play important roles in energy production and photosynthesis, respectively.
Mitochondria are often referred to as the "powerhouses" of the cell because they are responsible for producing the majority of the cell's energy in the form of adenosine triphosphate (ATP) through the process of cellular respiration. They have a double membrane structure and contain their own DNA, which is separate from the cell's nuclear DNA.
Chloroplasts, on the other hand, are found in plant cells and some protists, and are responsible for carrying out photosynthesis, the process by which plants convert sunlight into energy. Chloroplasts contain chlorophyll, a green pigment that captures sunlight and uses it to convert carbon dioxide and water into glucose and oxygen.
Both mitochondria and chloroplasts are believed to have originated from ancient prokaryotic cells that were engulfed by early eukaryotic cells in a process known as endosymbiosis. This is supported by the fact that both organelles have their own DNA and ribosomes, similar to bacteria.