A hectare is equal to 10,000 square meters. Its symbol is "ha." The hectare is used as a unit of land measurement in the metric system, similar to how the acre is used as a unit of land measurement in the United States Customary measure.
The word "hectare" is French for "100 ares." It is derived from the Greek word "hekaton," which means, hundred and the Latin word "area," which means a vacant piece of ground.
In 1795, when the metric system was introduced by the French National Convention, the term "are" was introduced to mean 100 square meters. However, in 1960 when the International System of Units was introduced, the are was not recognized as a unit of measure. Nevertheless, the hectare continues to be accepted for use within the International System of Units.