BIM, or Building Information Modelling, is a digital representation of a building or construction project that integrates all of the relevant data and information related to the design, construction, and management of a building. A BIM model is a 3D digital model that combines the geometry, physical and functional characteristics, and performance information of a building or construction project.

The purpose of BIM is to provide a single source of information for all stakeholders in a construction project, including architects, engineers, contractors, and building owners. This information can be used to streamline the design, construction, and operation of buildings, reduce costs, and improve overall building performance.

BIM models can also be used for simulation, analysis, and visualisation, which helps to identify potential problems early in the design process, reducing the risk of errors and saving time and money. With BIM, all stakeholders in a construction project can work together in a virtual environment, reducing the need for physical collaboration and ensuring that everyone has access to the same information.