Wire Arc Additive Manufacturing (WAAM) is a subset of Direct Energy Deposition (DED), an uprising transformative technology for its high deposition rates, cost-effectiveness, and suitability for large-scale production with minimal waste by utilizing a high-energy arc to melt metal wire and construct components layer by layer. This review explores the technology and compares it with other additive manufacturing methods. The paper also addresses the challenges that WAAM faces, such as process stability and quality, and mentions the proposed solutions, including advanced cooling techniques, AI-driven control systems, and hybrid heat sources. The review also highlights WAAM's applications across aerospace, automotive, and shipbuilding industries, and its potential in precision micro-manufacturing. Furthermore, it discusses how future advancements may drive broader industrial adoption, positioning WAAM as a key player in sustainable and efficient manufacturing.