$$\text{Zn}(\text{s}) + 2\text{HCl}(\text{aq}) \rightarrow \text{ZnCl}_2(\text{aq}) + \text{H}_2(\text{g})$$
The reaction is a single-displacement reaction, in which one element (zinc) replaces another element (hydrogen) in a compound. The reaction is also an exothermic reaction, meaning that it releases heat. The hydrogen gas produced in the reaction is flammable, and can be used as a fuel or to produce other chemicals.
