In
computer hardware, a
host controller,
host adapter, or
host bus adapter (
HBA) connects a
computer, which acts as the host system, to other
network and
storage devices. The terms are primarily used to refer to devices for connecting
SCSI,
Fibre Channel and
eSATA devices. However, devices for connecting to
IDE,
Ethernet,
FireWire,
USB and other systems may also be called host adapters.