Georgia’s currency is the lari (GEL). It has been fairly stable since it was introduced in 1995. One lari is divided into 100 tetri.
Banknotes come in denominations of one, two, five, 10, 20, 50, 100 and 200 lari; coins run from one tetri to two lari.
ATMs, generally accepting MasterCard, Visa, Cirrus and Maestro cards, are plentiful in cities and towns.
There are also plenty of banks and small money-exchange offices in most towns and cities, where you can exchange US dollars, euros and sometimes sterling and the currencies of Georgia's neighbouring countries.
You can make purchases with credit cards at some hotels, restaurants and shops, though less frequently outside Tbilisi.
Common tipping practice in restaurants is just to round up the bill to the next round number.