What does the term efficiency in economics mean?

In economics, efficiency refers to the optimal allocation of resources to maximize output and minimize waste. It encompasses various concepts, including productive efficiency, where goods are produced at the lowest cost, and allocative efficiency, where resources are distributed according to consumer preferences. An efficient economy operates in such a way that no additional output can be gained without sacrificing another good or service. Overall, efficiency indicates that resources are being used in the best possible way to meet societal needs and wants.