The chapter explores the critical role of rubber and rubber materials in the automotive industry. Beginning with their historic introduction through John Dunlop’s pneumatic tire in 1888, the chapter details how rubber evolved from basic tire applications to essential components such as engine mounts, vibration isolators, seals, hoses, and gaskets. The transition from natural to synthetic rubbers improved durability, heat resistance, and chemical stability. Rubber’s performance is further enhanced through vulcanization and additives such as carbon black and silica. Detailed classifications are provided based on composition, temperature tolerance, and function. The chapter highlights rubber's mechanical properties, including elasticity and vibration damping, and its susceptibility to aging under environmental stress. Modern developments include bio-rubber research and recycling, aligning with sustainability goals. The application-focused sections cover radial seals, brake system cuffs, hoses, liquid gaskets, and vibration isolation products, underscoring rubber's indispensable function in automotive engineering.