SolidWorks is 3D design software that allows users to sketch ideas and experiment with designs to create 3D models using features. Key aspects covered in the document include: - The SolidWorks model consists of parts, assemblies, and drawings. - Features are the basic building blocks used to construct parts in SolidWorks. Common shape features include bosses, cuts, fillets, and holes. - Dimensions and geometric relationships are used to define the size and relationships between features. - The document provides instructions on how to start SolidWorks, create sketches and basic features, and add dimensions.