Draw non-indexed, non-instanced primitives.
void Draw( UINT VertexCount, UINT StartVertexLocation );
Number of vertices to draw.
Index of the first vertex, which is usually an offset in a vertex buffer; it could also be used as the first vertex id generated for a shader parameter marked with the SV_TargetId system-value semantic.
A draw API submits work to the rendering pipeline.
The vertex data for a draw call normally comes from a vertex buffer that is bound to the pipeline. However, you could also provide the vertex data from a shader that has vertex data marked with the SV_VertexId system-value semantic.