The Internet is an international network formed by connecting computer networks together with telephone lines, making it the world's most widely used WAN. It originated in 1969 as the US Department of Defense's ARPANET project and grew in the 1980s with NSFnet. Private networks later interconnected with ARPANET and NSFnet to form the modern Internet. The Internet has brought society together globally by providing universally accessible information. It is used for education, communication, commerce, entertainment, and planning activities like travel. When used properly, the Internet acts as a powerful tool that provides vast resources in a short amount of time.