Email evolved from simple online messaging between computers to a widely used communication tool. It was invented in the 1960s on ARPANET, an early network connecting computers at universities. As the internet became commercially available in the 1990s, email access expanded and web-based email services emerged, popularizing personal email use. Today, email remains one of the most widely used applications worldwide, with billions of users communicating daily through personal and business accounts on desktops and mobile devices.