PDA’s are handheld computers, but have become much more versatile over the years and are also known as pocket computers or palmtop computers and have many uses:
sending and receiving E-mails
typewriting and word processing
making and writing on spreadsheets
scanning bar codes, use as a radio or stereo
playing computer games
recording survey responses
and Global Positioning System (GPS).
Newer PDAs also have both colour screens and audio capabilities, enabling them to be used as mobile phones (smartphones), web browsers, or portable media players. Many PDAs can access the Internet, intranets or extranets via Wi-Fi. Many PDA's employ touch screen technology.
iPod is a brand of portable media player designed and marketed by Apple and launched in October 2001.
The line-up currently consists of:
the original style hard drive-based flagship iPod classic
the premium iPhone-like iPod touch
the mid-level video-capable iPod nano
the low-end screenless iPod shuffle.
Former products include:
the compact iPod mini (replaced by the iPod nano)
the high-end spin-off iPod photo (re-integrated into the main iPod classic line).
The current iPod classic models store media on an internal hard drive , while all other current models use flash memory to enable their smaller size. Like many digital music players, iPods can also serve as external data storage devices .