Different cabinets are constructed in different ways. This post describes a specific type of join, known as a dado cut. There are links to more general posts the bottom of this one.
A dado cut is where a long groove is cut into one piece of wood for purposes of (generally) inserting another.
In your kitchen cabinets this is typically how your bottom cabinets and your built in shelving is installed.
As you can see from the picture on the right, the grove is cut into the side piece, and the bottom or shelf sits in the groove.
This makes the shelf much more secure than it would be with nails, screws, or those shelf holding brackets that are common in less expensive units.
It also provides a large surface area for glue, which in and of itself helps make the joint stronger.
I hope this information is useful to you. Other details about cabinet construction is available in other articles.
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