mount point
also: mount directory
A directory in the filesystem where a storage device, partition, or filesystem is attached and made accessible. Once mounted, the contents of that device become available under that directory path.
A mount point is simply a directory that serves as the entry point to access files on a mounted filesystem or device. When you mount a device at a mount point, the directory's contents are temporarily replaced by the contents of the mounted filesystem.
For example, if you have a USB drive and mount it at /mnt/usb, the /mnt/usb directory becomes the mount point. Afterward, accessing /mnt/usb/myfile.txt actually accesses a file on the USB drive, not the original contents of /mnt/usb.
Common mount points include / (root), /home, /var, and /mnt. You can view all currently mounted filesystems and their mount points using the mount command or by checking /etc/mtab.