The Flash Point is the lowest temperature at which enough vapour escapes to form an ignitable mixture with the ambient air (EN 1127-1). ►Video
The Auto-Ignition Temperature is defined as the lowest temperature at which vapours, from a flammable liquid in contact with air or a hot object, self-ignites without external assistance. Many widely used chemicals (e.g. Petrol) have an auto-ignition point of 220 °C (428 °F) or greater.