Official Autodesk Revit Website Here:
www.autodesk.com.au/revit
Autodesk Revit is a tool used in the process of BIM. Revit can be compared to how a hammer relates to a builder. Without it the house (BIM) cannot be built.
There are many tools on the market used to produce BIM however Autodesk Revit by far holds the majority market share and is the preferred BIM package in Australia and abroad.

Illustration 1.1: Autodesk Revit (Tool) – BIM (Process) Comparison
Prior to Revit designers used 2D AutoCAD to produce scaled drawings. Each perspective was a separate scaled drawing. When a design change needed to be made, each view (Plan, Elevation, Section, 3D Perspective) had to be changed separately.

Illustration 1.2: Traditional 2D Autodesk AutoCAD Overview
Revit is now replacing 2D AutoCAD with the ability to create 1:1 scale virtual models of buildings and take “snapshots” from different perspectives in order to create Floor Plans, Elevations, Sections and 3D Perspective views.

Illustration 1.3: Revit BIM 3D Model Approach Overview
Architects, Engineers and Designers create these 3D models using Revit Content (also known as Revit Families). This Revit Content forms the basis of a Revit Model (like nails are to a builder's hammer) and allows the BIM process to be undertaken.
The Top 5 insights into Autodesk Revit & BIM
In order to save you time scouring the web, I have provided an easy to follow blog series containing information and videos from around the world and my own personal experience with the power of Revit.
Simply follow the links:
1. Revit – more than just Architecture
...where the building design process is heading in the 21st century

... the most important difference between Revit and 2D AutoCAD

... the elements that make up and reside within a Revit model

...your marketing team is going to love Revit!

...design, construction, facility management and demolition
