Differing kinds of desiccant dehumidifiers work in other ways, but the principle course of action they use to extract dampness with the air is both absorption or adsorption. Absorption happens once the desiccant substance dissolves as it's going to take humidity with the air, as is the case with moisture https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/