Differing kinds of desiccant dehumidifiers do the job in other ways, but the main approach they use to extract moisture with the air is both absorption or adsorption. Absorption occurs if the desiccant substance dissolves as it's going to take dampness within the air, as is the situation with moisture https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/