Personal Digital Assistants (PDAs) are handheld devices designed to help users manage their daily tasks and information. They typically include features such as calendars, contact lists, note-taking capabilities, and task management tools. PDAs can also connect to the internet, allowing users to access emails and browse the web. Originally popular in the late 1990s and early 2000s, PDAs have largely been replaced by smartphones, which combine the functions of a PDA with advanced communication features. Notable examples of early PDAs include the Palm Pilot and Apple Newton, which paved the way for modern mobile technology.