An exchange-traded fund (ETF) is collection or basket of securities traded on a financial exchange. ETFs can be bought and sold via brokers just as stocks can. ETFs can have any type of investment concentration and offer investors exposure to thousands of stocks, commodities or bonds operating within or originated in the United States, emerging markets such as India or Brazil, Europe or any other geography. It can also focus on a specific industry or sector such as banking, telecommunications, minerals or technology.