The written history of Afghanistan can be traced back to around 500 BCE when the area was under the Achaemenid Empire, although evidence indicates that an advanced degree of urbanized culture has existed in the land since between 3000 and 2000 BCE. Alexander the Great and his Macedonian army arrived in what is now Afghanistan in 330 BCE after conquering Persia during the Battle of Gaugamela. Many powerful foreign kingdoms have established their capitals inside the modern state of Afghanistan, including the Greco-Bactrians, Mauryas, Kushans, Kabul Shahi, Saffarids, Samanids, Ghaznavids, Ghurids, Timurids, Mughals, Hotakis, Durranis, and others

Afghanistan (meaning "land of the Afghans") has been a strategically important location throughout history. The land served as "a gateway to India, impinging on the ancient Silk Road, which carried trade from the Mediterranean to China". Sitting on many trade and migration routes, Afghanistan may be called the 'Central Asian roundabout' since routes converge from the Middle East, from the Indus Valley through the passes over the Hindu Kush, from the Far East via the Tarim Basin, and from the adjacent Eurasian Steppe.

Afghanistan, officially the Islamic Republic of Afghanistan, is a landlocked sovereign state forming part of Central Asia, South Asia, and to some extent Western Asia. It has a population of around 30 million inhabiting an area of approximately 652,000 km2 (252,000 sq mi), making it the 42nd most populous and 41st largest nation in the world. It is bordered by Pakistan in the south and the east, Iran in the west, Turkmenistan, Uzbekistan, and Tajikistan in the north, and China in the far northeast.