K^+, or potassium ion, is a positively charged ion that plays a crucial role in various biological processes. It is formed when a potassium atom loses one electron, resulting in a charge of +1. Potassium is an essential mineral found in many foods, such as bananas and potatoes, and is vital for maintaining proper cell function, nerve transmission, and muscle contraction. In the human body, K^+ helps regulate fluid balance and is important for heart health. It works alongside other electrolytes, like sodium and chloride, to maintain the body's electrical balance. Abnormal levels of potassium can lead to health issues, including hyperkalemia or hypokalemia, which can affect heart rhythm and overall well-being.