What is the main purpose of using BIM softwares over cad softwares, and what benefits can we get from new technoligies such as 3d scaning in architecture and urban planning ?

BIM softwares allow for a coordinated integration of the digital work process between multiple users therefore creating an easier shared workflow between multiple professionals.3D scanning can be very useful when it comes to quickly modeling existing objects or buildings available in our surroundings to be analyzed and interpreted in our own digital work.