This is a type of account where you freeze a certain sum of money for a specific period which is agreed by yourself and the bank and on that basis, you will get interest paid to you at the end of the agreed period. This type of account can be broken before the agreed period, however, banks charge for early deposit upliftment. Deposit accounts can be in the form of fixed, term or time deposits.
It is an interest which is earned but not been paid.
It is the time period for which you have locked your money in the deposit account.
Banks in UAE usually payout interest either monthly, quarterly, half-yearly or annually.
Banks may offer option to invest in different foreign currency including USD, pounds sterling and euros. However, this depends on banks and the type of investment account.
Few investment accounts have lock in period during which one doesn't have access to the funds.