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How and why does the exchange rate of a currency change almost everyday?
Money is money because people believe it is money. By "believe it is money", I mean that they expect they will be able to turn it into useful goods or services (food, rent, houses, truckloads full of iron ore, mining equipment, massages at the spa, helicopter rides, iPads, greenhouses, income streams to support your future retirement, etc). Foreign exchange rates change because people's ideas about how much useful goods or services they can get with various currencies change. For example: if the Zimbabwe government suddenly printed 10 times as much money as used to exist, you probably couldn't use that money to buy as much food at the Zimbabwe-Mart, so you wouldn't be willing to give people as many US-dollars (which can buy food at the US-Mart) for a Zimbabwe-dollar as you used to be able to. (It's not exactly that easy, because - for instance - food in the US is more useful to me than food in Zimbabwe. But people still move around all sorts of things, like oil, or agricultural products, or minerals, or electronics components.) The two main things that affect the value of a currency are the size of the economy that it's tied to (how much stuff there is to get), and how much of the currency there is / how fast it's moving around the economy (which tells you how much money there is to get it with). So most exchange rate shifts reflect a change in people's expectations for a regional economy, or the size of a money supply. (Also, Zimbabwe is doing much better now that it's ditched their own currency - they kept printing trillions of dollars' worth - and just trade in US dollars. Their economy still needs some work, but... better.)