An alkaline battery is a type of disposable battery that uses an alkaline electrolyte, typically potassium hydroxide, to generate electrical energy. These batteries are commonly used in household devices like remote controls, flashlights, and toys due to their long shelf life and reliable performance. Alkaline batteries come in various sizes, including AA, AAA, C, D, and 9V. They are known for their higher energy density compared to older battery types, such as zinc-carbon batteries, making them a popular choice for powering everyday electronics.