An FPSO is a floating production, storage, and offloading unit that produces crude oil and gas. It has a topside structure for production and a hull for floating. An FPSO requires subsea production systems, flowlines, and a shuttle tanker for offloading. Stability and mooring calculations are crucial for an FPSO to remain floating. The detailed design process includes piping and instrumentation diagrams, structure drawings, and block production drawings. Construction involves procuring materials, assembling blocks in dry dock, then completing work onshore after launching.