This article aims to accomplish a review of state of the art in the humidification-dehumidification (HDH) desalination process. Foremost, an introduction to the main desalination technologies is presented to clarify the positives and negatives effects of each. Costs and project data are presented for experimental and theoretical studies. The information is shown by using tables, explaining the major variables, and the obtained results for each study. News regarding plants under the sea and packed beds are the main considerations of the present paper.