Final answer:
The 2 electrodes used to create a spark are the anode and the cathode, where oxidation and reduction occur respectively, allowing for electron flow and spark generation.
Step-by-step explanation:
The electrodes used for creating a spark in various devices such as combustion engines or electrochemical applications are known as the anode and cathode. The anode is the electrode where oxidation occurs, and electrons are forfeited. This electrode is typically considered negative in an electrochemical cell and positive in an electrolytic cell. Conversely, the cathode is the electrode where reduction happens, and electrons are acquired, which is positive in an electrochemical cell and negative in an electrolytic cell. In summary, to create a spark, these 2 electrodes establish a closed circuit that allows the flow of electrons, generating a spark between the two.