Assembly is a collection of products please together in such a way that they serve a purpose most of the components that you see around our assemblies, for example, if all as an assembly consisting of components like keypad screen, SIM card and many chips and screws inside ceiling fan is a collection of rings, ball bearings, motors, screws, etc. and assembly can have a sub assembly, like Ben has refill cap and base container. refill itself is an assembly of plastic in container and the tip for writing. So refill is a sub assembly fitted into an assembly. Now that we have learned more linked products, let us move on to assembling them. The assemble option in fusion 360 will allow us to position different parts with respect to each other and also leave some degrees of freedom to move if required.