Exhibition graphics design is the design of everything visitors read and see on the walls and surfaces of an exhibition: the title wall, section text, object labels, wayfinding, large images, and the typography and color that tie them together. It makes an exhibition legible, and it sets its tone.
An exhibition designer shapes how visitors move through and experience an exhibition. That covers the layout of the gallery, the walls and structures, lighting, graphics and the way they all fit around the objects, from the first concept through installation.
The curator decides what the exhibition says, and the designer decides how visitors experience it. The work goes best when the designer joins early, both sides share the exhibition's central idea in plain terms, and decisions about space, text and objects are made together.
Start from the subject and the character of the work, then build a small visual system of type, color and a few repeatable elements that can stretch from the poster to the title wall to the labels. An exhibition identity makes the show read as one thing, in the gallery and outside it.
Treat the space as a design material. Decide what should disappear, what to use, and what the visitor should feel on arrival. Paint, light and a few strong moves can go a long way.
Build less, choose materials with their end in mind, and let the existing gallery do part of the work. The most useful questions are what actually needs to be made and what happens to each element when the show closes.
Look for a team that has done work like yours, ask who will actually be doing it, and make sure you understand how they make decisions and what they need from you. Fit and communication matter as much as the portfolio.