Viscoelastic materials are a type of material that display both viscous (flowing) and elastic (spring-like) properties when subjected to stress or deformation. These materials exhibit time-dependent behavior, meaning their response to applied stress or strain changes over time. Research in the area of viscoelastic materials focuses on understanding and characterizing the mechanical properties, behavior, and applications of these materials. This includes studying their deformation, relaxation, creep, and stress relaxation properties, as well as investigating the relationship between their microstructure and macroscopic behavior. Viscoelastic materials are commonly found in a wide range of applications, including polymers, biological tissues, textiles, and building materials. Understanding the mechanical behavior of viscoelastic materials is important for developing new materials with improved performance and for optimizing the design of products and structures that incorporate these materials.