desert / dessert are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
desert: (noun) arid land with little or no vegetation. (verb) leave behind.
dessert: (noun) a dish served as the last course of a meal.
desert: d·EH·z·er·t
dessert: d·ih·z·ER·t
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)