VLB, also known as VL-bus, is an extension connector found on some platforms for computers. To speed up visual processing, a VLB link adds an extension port for a video device. An ISA space and a second spot in order behind it make up a VLB extension slot. When paired with a 50 GHz 486 CPU, it provided memory capacity of up to 200 MB/s, compared to the ISA bus's limit of 16 MB/s.

In 1992, the VLB interface was developed, and computers made for the Intel 486 CPU frequently featured it. At the time, computers' ISA bus standard lacked enough capacity to support graphics devices, which were growing in popularity as graphical user interfaces proliferated.

The VLB standard was developed by the Video Electronics Standards Association (VESA) to add a second connection to the ISA interface to increase memory capacity for more sophisticated graphics devices.

For a brief period of time, the VLB port was accessible on processors. The VLB link was discontinued after the Intel Pentium processor was released because it was made for the 486 processor version. The PCI interface, which provided extension ports with higher rates than ISA slots and a much smaller dimension than VLB slots, was a feature of chipsets made for the Pentium CPU.