ABC transporters are a group of proteins that help move various substances across cell membranes. They use energy from ATP (adenosine triphosphate) to transport molecules, such as ions, sugars, and drugs, into or out of cells. This process is essential for maintaining cellular function and homeostasis. These transporters are found in all living organisms, from bacteria to humans. They play crucial roles in processes like nutrient uptake, waste removal, and drug resistance. Understanding ABC transporters is important for developing new therapies for diseases, including cancer and infections, where these proteins can affect treatment outcomes.