What is hypergolic rocket fuel?

We all know how rocket science is relatively complicated. Actually, not entirely. Hypergolic fuels are pretty simple. A Hypergolic fuel mixture is usually used in rockets, and consists of 2 main materials, a fuel and an oxidizer. The fuel is usually a form of Hydrazine, and the oxidizer is usually Dinitrogen Tetroxide. The Hydrazine and Dinitrogen Tetroxide ignite spontaneously upon contact, which is why it is considered Hypergolic. Hypergolic fuels are indeed less complicated than what can be called "usual" rocket fuel, like a mixture of RP-1 (rocket grade kerosene), and LOX (liquid oxygen). The LOX helps ignite your fuel, which in this case is RP-1/Kerosene. You also need an outside ignition source to ignite the LOX + Kerosene mixture, as they do not instantly combust. With Hypergolic fuels, you don't need an outside ignition source, at all. They ignite themselves, an outside ignition source like ignition fluid or spark plugs would be quite useless. SpaceX's Crew Dr