Some of the most useful features of electronic organizers are the address book, memos and to-do lists, Internet connectivity, email and audio capabilities. Known as personal digital assistants, or PDAs, as of 2015, they also have the search functionality and can sync with desktop computers.
A user can store a large number of contacts or notes on a PDA and easily find specific items using the search function. Nearly all PDAs can access the Internet or can connect to intranets or extranets via Wi-Fi or Wireless Wide Area Networks. Thus, they support Web browsing and email and can sync with desktop computers to keep data up to date.
PDAs also have audio capabilities, enabling their use as portable media players and as mobile phones. With GPS functionality they aid in automotive navigation and increasingly appear in cars.
The term "personal digital assistant" also applies to smartphones, but people don't usually refer to them as such. Some of the most popular ones have the Windows Mobile or Android operating systems.