efficiency

Efficiency refers to how well a system, process, or device uses resources—such as time, energy, or materials—to achieve its desired outcome. An efficient process delivers maximum output with minimal waste or effort, meaning it accomplishes its goal without unnecessary costs or loss. For example, an efficient car engine converts more fuel into motion, reducing fuel consumption and emissions. Overall, efficiency measures how effectively resources are used to produce the best possible results, helping save money, energy, and time.