This chapter explores the properties, classifications, and applications of titanium and its alloys, emphasizing their growing role in the automotive industry. Titanium's high specific strength, excellent corrosion resistance, and heat tolerance make it ideal for engine components such as valves, rods, and mufflers. The chapter also highlights the mechanical properties influenced by microstructures and discusses surface treatments, particularly oxidation, to overcome poor wear resistance. Although initially used in high-performance vehicles due to high cost, recent technological advances aim to enable broader use in mass-produced cars to improve fuel efficiency and reduce CO₂ emissions. Tables and figures illustrate alloy compositions, historical usage, and property comparisons.