If you say you’ll do something in a flash, it means almost instantaneously, with no waiting. Or it can mean a sudden burst of light that illuminates everything. And if you’re a comic book lover, it refers to the super hero who is the fastest man alive. But in the world of IT, flash usually means just one thing (especially since a certain web-based media standard has fallen out of favor). For businesses building storage infrastructures, flash means using fast, memory-based storage to access data instantaneously, just as if it was system memory.