Usage refers to the way in which a word, phrase, or concept is employed in language or practice. It encompasses the rules and conventions that govern how something is used, including grammar, context, and appropriateness. For example, the usage of a word can change depending on the audience or setting, such as formal versus informal communication. In a broader context, usage can also apply to the consumption of resources or products. This includes how much of a particular item, like electricity or water, is utilized over a specific period. Understanding usage patterns can help in managing resources more efficiently and promoting sustainability.