It also includes money in the bank current accounts, and money in various short-term investment accounts that can be quickly be turned into available cash.
It is common for a Balance Sheet to show only a tiny amount for cash. This is because the business has an overdraft and only such things as the petty cash are included.
Practical management usage of the term cash includes a negative figure for an overdraft.
A Cash-Flow Forecast can often result in a series of forecast overdrafts.