What is included in cash and cash equivalents?

The term cash and cash equivalents includes: currency, coins, checks received but not yet deposited, checking accounts, petty cash, savings accounts, money market accounts, and short-term, highly liquid investments with a maturity of three months or less at the time of purchase such as U.S. treasury bills and commercial paper. The items included as cash and cash equivalents must also be unrestricted

What I found out from the items that included in cash and cash equivalents, for instance, coins, currency, checks that didn't have deposited yet, also, accounts checking, money market, high liquidity in long-term investments and probably short term either(Accounting Coach).

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Cash and cash equivalents are highly liquid assets including coin, currency, and short-term investments that typically mature in 30-90 days

Cash refers to coins and currencies plus deposits held in financial institutions and checks to be deposited in those same institutions. 

A cash equivalent is a highly liquid investment having a maturity of three months or less. it should be at minimal risk of a change in value.

Inscribed in cash each liquid funds that are easy to use directly, such as cash on hand and cash in banks

Goods sold actually did not get the cash value