Irrigation involves providing artificial water to crops when there is not enough rain, particularly in arid areas. It benefits crop yields and food production but can also cause issues like groundwater pollution, damper climates, and water logging. The main types of irrigation are surface irrigation methods like flood and furrow irrigation, sprinkler irrigation, and drip irrigation. Flood irrigation was likely the first method used and involves submerging fields, while furrow irrigation only wets portions of fields between furrows. Sprinkler systems apply water as a spray through pipes while drip irrigation uses a network of pipes and emitters to precisely deliver water to plant roots.