Young's modulus is a material property that describes the stiffness of a solid material when it is stretched or compressed. Some common synonyms for Young's modulus are elastic modulus, modulus of elasticity, and tensile modulus. These terms all refer to the same fundamental property of a material, which is a measure of how much it resists deformation when subjected to external forces. Other related properties include shear modulus, bulk modulus, and Poisson's ratio. These properties are all important for understanding the behavior of materials under different loading conditions, and are essential for designing and engineering a wide range of products and structures.