A free trade area (FTA) refers to a specific region where two or a group of countries seal economic cooperation. The objective of such an arrangement is to reduce barriers in trading, relating to tariffs and import quotas. Such agreements will encourage the free trade of goods and services between the member countries.
You can refer to the following link for a list of free trade agreements entered by Singapore.
Free trade zones refer to a location where a company can import goods and re-export without the involvement of customs agencies in Singapore and can be exempted from import duties and taxes.