3D modelling is a way of creating 3 dimentional, or 3D image design before you make or build the object. It is easier to use 3D modelling software to create the image then building the object and then altering once it is created.
What is 3D modelling used for?
3D modelling is used to create a design for a product, from cars to rollercosters! The 3D modelling software is very realistic. If you were for example to build a kitchen and fit it with cupboards and appliances it helps you for measurements and colour themes.