Efficiency is a measure of how well a system, process, or machine performs in relation to the amount of energy or resources used. It is calculated by dividing the output of a system by the input of the same system. For example, if a machine uses 100 watts of electricity to produce 100 watts of power, then the efficiency of the machine is 100%. Efficiency is important in all aspects of life, from energy efficiency in homes and businesses to efficiency in the workplace. Efficiency is also important in manufacturing and production, as it helps to reduce costs and increase productivity. Efficiency is also important in transportation, as it helps to reduce fuel consumption and emissions. In short, efficiency is a measure of how well a system, process, or machine performs in relation to the amount of energy or resources used. It is an important factor in any industry or organization, and is a key indicator of success.