What does a water electrolyzer do and how does it function in the process of electrolysis?

A water electrolyzer is a device that uses electricity to split water into hydrogen and oxygen gas through a process called electrolysis. In electrolysis, an electric current is passed through water, causing the water molecules to break apart into their constituent elements. The hydrogen gas is collected at the cathode (negative electrode) and the oxygen gas is collected at the anode (positive electrode). This process is used to produce hydrogen gas for various industrial applications and as a potential clean energy source.