A farm is an area of land, including various structures, devoted primarily to the practice of farming, the production and management of food, either produce or livestock rearing. It is the basic production facility in food production. Farms may be owned and operated by a single individual, family, or community, or by a corporation or company. A farm can be a holding of any size from a fraction of a hectare to several thousand hectares.
The term farming covers a wide spectrum of agricultural production work. At one end of this spectrum is the subsistence farmer, who farms a small area with limited resource inputs, and produces only enough food to meet the needs of his/her family. At the other end is commercial intensive agriculture, including industrial agriculture. Such farming involves large fields and/or numbers of animals, large resource inputs (pesticides, fertilizers, etc.), and a high level of mechanization. These operations generally attempt to maximize financial income from grain, produce, or livestock.
Traditionally, the goal of farming was to create a profit, and to produce an amount of cultivated material (i.e. corn, wheat, etc) so that the resulting harvest has more worth than the cost of planting such a harvest. The costs could include the acquisition of seeds as well as the time and energy required to tend to such a venture. The resulting product is often used to sustain those who farm as both a food to eat and a commodity to sell.
For more details see:-
Extract from wikipedia article Farm