Internal I/O Connectors, Expansion Slots, Rear Panel I/O

Sulle specifiche della mia mobo ho questi dati. Qualcuno mi sa spiegare cosa significano? Cosa sono le varie cose indicate? Grazie a trutti!

Internal I/O Connectors:
2 x Serial ATA connectors
2 x IEEE 1394 pin headers
2 x UltraDMA 100/66 Bus Master IDE
1 x FDD
2 x USB 2.0 (Support 4 ports by cable)
1 x S/P DIF input/output pin header
CD/AUX in
1 x Game port pin header

Expansion Slots:
1 x AGP Pro slot
5 x PCI slots (PCI 2.3 compliant)

Rear Panel I/O:
4 x USB 2.0 ports
1 x RJ45 LAN port
1 x LPT port
2 x COM ports
3 x Audio ports (Line-in / Line-out / MIC)
2 x PS/2 ports (Keyboard/Mouse)