AutoCAD LT is a lighter version of AutoCAD, which can be commonly referred to as a simplified version. It is not as full-featured as AutoCAD, but it is good enough to improve efficiency, reduce resource usage, and run very fast.
Compared to AutoCAD, AutoCAD LT does not have three features: AutoCAD's 3D conceptual design features, advanced documentation features such as AutoCAD's parametric drawing tools, and no support for extensions or customization. Otherwise, AutoCAD LT has all of the other AutoCAD features and is fully compatible with AutoCAD. For example, the ability to create, prepare and share engineering drawings accurately and efficiently.