Identity, layout and the visual system that keeps a brand consistent everywhere it appears — from the wordmark down to the templates someone on your team can run without a designer on call.
A logo on its own solves very little. What makes a brand hold together is the system around it: type, colour, spacing and a set of templates that keep every future post, deck and page recognisably yours. Design work here is done alongside the build, so what gets designed is what can actually ship.