What exactly does it mean to have cash?

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So I hear from places such as The Real Estate Guys, investors like Robert Kiyosaki and even Trump saying its always good to have cash ready whenever the next correction comes. For the average joe, our money is deposited in the large banks. Although it is arguably unlikely, these banks could fail if all hell breaks loose. I know most banks are FDIC insured, but who knows how that whole process would go if it becomes necessary.

Therefore, when these guys are saying they have cash ready, do they mean actual physical US dollars, cash in banks (like most Americans), or some other form of asset?