The INP file format is a plain-text input file primarily used by Abaqus, a powerful suite of software applications for finite element analysis (FEA) and computer-aided engineering. These files contain the complete definition of a simulation model, including geometry, material properties, boundary conditions, loading scenarios, and analysis steps. Because they are structured in a human-readable ASCII format, engineers can manually edit them to fine-tune complex simulations or automate the generation of models using scripts. The file is organized into specific sections defined by keywords (often starting with an asterisk, such as NODE or ELEMENT), which the Abaqus solver parses to perform numerical calculations. Beyond Abaqus, the INP extension is also used by various other engineering and scientific software packages, such as LS-DYNA or specialized fluid dynamics tools, to store configuration and input parameters for computational models. Due to its text-based nature, it is highly portable and version-control friendly, making it a standard in industrial and academic research environments where structural integrity and physical behavior simulations are critical.