Rejuvenation refers to the process of restoring vitality and energy to an individual or system. In biological terms, it often involves the renewal of cells and tissues, leading to improved health and function. This concept is commonly associated with aging, where rejuvenation aims to reverse or slow down the effects of time on the body. In a broader context, rejuvenation can apply to various fields, including environmental science, where it describes efforts to restore ecosystems, or urban planning, which focuses on revitalizing city areas. Techniques and practices in these areas aim to enhance sustainability and improve quality of life.