If you need to connect your PS/2 mouse or keyboard, and only have USB ports on your computer, you can attach the device to this smart adapter and insert it directly into the USB port. However, this only works with COMBI devices, which are designed for USB conversion. This applies to some of Logitech's products, for example.
Sandberg Adapter PS/2 on USB-port
Sandberg Adapter PS/2 on USB-port. Gender: Male/female, Connector(s): PS/2, USB, Adapter type: PS/2. Color of product: White. Width: 0" (0 mm), Depth: 0" (0 mm), Height: 0" (0 mm). Package width: 0.335" (8.5 mm), Package depth: 0.0787" (2 mm), Package height: 0.492" (12.5 mm)