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An are is a metric unit of measurement used to describe the size of land areas, equal to 100 square meters. It's useful for measuring medium-sized plots of land, such as farms or properties, in countries that use the metric system.
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Image comparing the hectare (the small blue area at lower left) to other units. The entire yellow square is one square mile. The hectare (/ˈhɛktɛər, -tɑːr/; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm), that is, 10,000 square metres (10,000 m), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is about 0.405 hectares and thus one hectare is about 2.47 acres.
St. Enda's GAA ground, in Omagh. The playing field used in Gaelic football and hurling is a little over a hectare in size. In 1795, when the metric system was introduced, the are was defined as 100 square metres, or one square decametre, and the hectare ("hecto-" + "are") was thus 100 ares or 1/100 km (10000 square metres). When the metric system was further rationalised in 1960, resulting in the International System of Units ( SI), the are was not included as a recognised unit. The hectare, however, remains as a non-SI unit accepted for use with the SI and whose use is "expected to continue indefinitely". Though the dekare/decare daa (1000 m) and are (100 m) are not officially "accepted for use", they are still used in some contexts.