Autodesk Civil 3D: 3D Drawing Techniques

Royalty-free is a pricing arrangement in which one payment replaces the per-copy, per-view and per-year fees a licence could otherwise charge, and it decides nothing else about how the asset may then be used.

A web template is a pre-built layout sold as permission to use it in one end product, delivered either as flat files you adapt or as a theme wired into a content management system and its release cycle.

A design system is a versioned set of tokens, coded components and usage rules that a team builds interfaces from, so an interface decision is made once and then imported rather than redrawn on every screen.