 Solar energy is a renewable energy source that can be used for various applications today. To effectively store and use this energy, a storage medium is required which can hold excess energy and release it when needed. Phase change materials, PCMs, are a type of material that can store heat and provide high-density energy storage. PCMs have been used in solar applications such as solar power generation, water heaters, solar cookers, and solar dryers. This paper reviews the use of PCMs in these applications and how they can be used commercially. This article was authored by EMMO Feature, Tukumura Indramalia, Eridina Susan Silatanga, and others.