STAAD or STAAD.Pro is a structural analysis and design software application that was originally developed by Research Engineers International in 1997. It is a widely used software for developing and analyzing the designs of various structures, such as petrochemical plants, tunnels, bridges, and more. STAAD.Pro provides a flexible modeling environment, fluent data collaboration, and advanced features. It is the best structural analysis and design software that supports Indian as well as all international design codes. STAAD can be used for analysis and design of all types of structural projects from plants, buildings, and bridges to towers, tunnels, metro stations, water/wastewater treatment plants, and more. Some of the key features of STAAD.Pro include analytical modeling, design codes, interoperability, and advanced analysis capabilities.