USB Port can be disabled from BIOS or Device Manager. If it is disabled from BIOS then go to the BIOS by pressing DEL at the startup (Most Common, However it can change as per the desktop/Laptop) and...
AGP was designed to provide a faster interface than PCI for graphics cards. Graphics cards were needing to move more data than the PCI bus could handle. AGP is now obsolete, as data throughput...
Ports are something where you can connect output devices and other devices. Here is a list of different ports you can have:USB portsSD card reader portSATA ports (located on the motherboard)