The British Pound Sterling (GBP) is the official currency of the United Kingdom. It is a major currency for international trading and is used for investments in various financial markets. It is the fourth most traded currency in the world, after the US dollar, the euro and the yen. The GBP is also a key currency for the foreign exchange market and is one of the most liquid currencies in the world. Investors use the currency to buy and sell stocks and bonds in the UK, as well as to invest in other countries. The GBP is also often used as a benchmark to measure the value of other currencies.