CAESAR-II is a piping stress analysis software that is used to perform static and dynamic stress analysis of piping systems. It allows users to create new input files, configure analysis settings, generate input data by entering component details, resolve any errors in the input file, select applicable load cases for analysis, and generate a variety of output reports including displacement, restraint, stress, and sorted stress reports. The software also enables users to view the 3D model and stress results in graphics mode for visual verification.