What are the differences between SAN, NAS and DAS?

SAN(Storage Area Network);
SAN is used for applications to access BLOCK storage over an optical FC network using the SCSI protocol. (e.g. FibreChannel, iSCSI, FoE)

NAS(Network Attached System);
NAS is used for access to FILE storage over TCP/IP on an Ethernet network using either the CIFS (for Windows) or NFS (for Unix) protocol. (e.g. NFS, CIFS, AFS)

DAS(Direct Attached Storage);
DAS is a block device from a disk which is physically [directly] attached to the host machine. (e.g. IDE, SCSI, SATA)

Source: 
http://searchstorage.techtarget.com/tip/SAN-vs-NAS-Which-do-you-need
http://serverfault.com/questions/81723/what-is-the-difference-between-san-nas-and-das