What is kanban in warehousing?

Question

How do I apply kanban in our current system?

Answer 1

Kanban is the Japanese word for "signal." A kanban is a method for signalling that inventory needs to be replenished. There are several types of these "signals" ... an empty container, a light, an inventory card, are all common types of kanbans.

Answer 2

With shortened lead times a constant goal in JIT, a system is needed to generate the reorder point signal without having to rely on a formal, structured system that could take time to react. 
A simple card system called Kanban, which roughly translated from Japanese means card or ticket.
The system works very simply. The Kanban signal (often a piece of cardboard) identifies the material to which it is attached.
The information on the Kanban will often include:

• Component part number and identification.
• Storage location.
• Container size (if the material is stored in a container).
• Work center