What is electrolyte? Describe the experiment showing flow of current in electrolyte.

An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water. The dissolved electrolyte separates into cations and anions, which disperse uniformly through the solvent. Electrically, such a solution is neutral. If an electric potential is applied to such a solution, the cations of the solution are drawn to the electrode that has an abundance of electrons, while the anions are drawn to the electrode that has a deficit of electrons

Setting up the experiment as shown in the above figure. When we switch ON the circuit we observe that the bulb does not glow.

On adding some salt in the distilled water, we observe that the bulb has started glowing.