Methylene Blue is a synthetic dye that has been used for various purposes, including as a medication and a laboratory stain. It is known for its vibrant blue color and is often used in biological research to stain cells and tissues, making them easier to observe under a microscope. In medicine, Methylene Blue has applications in treating conditions like methemoglobinemia, a blood disorder where hemoglobin cannot effectively release oxygen to body tissues. It also has potential uses in other areas, such as Alzheimer's disease research, due to its ability to influence certain biological processes.