Energy applications is a research field and academic concept focused on the principles, technologies, and methodologies for harnessing, converting, storing, and delivering energy from various sources for practical utility. This domain investigates the efficient and sustainable transformation of primary energy into usable forms, addressing the technical, economic, and environmental factors critical for meeting societal energy demands. Its significance lies in developing the infrastructure and systems essential for power generation, transportation, industry, and other sectors reliant on accessible energy.