Certificate Of Deposit - CD

What Does Certificate Of Deposit - CD Mean?
A savings certificate entitling the bearer to receive interest. A CD bears a maturity date, a specified fixed interest rate and can be issued in any denomination. CDs are generally issued by commercial banks and are insured by the FDIC. The term of a CD generally ranges from one month to five years.

Investopedia explains Certificate Of Deposit - CD
A certificate of deposit is a promissory note issued by a bank. It is a time deposit that restricts holders from withdrawing funds on demand. Although it is still possible to withdraw the money, this action will often incur a penalty. 

For example, let's say that you purchase a $10,000 CD with an interest rate of 5% compounded annually and a term of one year. At year's end,  the CD will have grown to $10,500 ($10,000 * 1.05).

CDs of less than $100,000 are called "small CDs"; CDs for more than $100,000 are called "large CDs" or "jumbo CDs". Almost all large CDs, as well as some small CDs, are negotiable.