Heat retention refers to the ability of a material or environment to hold onto heat over time. This property is important in various applications, such as building insulation, where materials like fiberglass or foam are used to keep homes warm by preventing heat from escaping. In nature, heat retention can be observed in bodies of water, like lakes and oceans, which absorb heat during the day and release it slowly at night. This process helps moderate temperatures in surrounding areas, contributing to a more stable climate and supporting local ecosystems.