You make the slots in the wood using a biscuit joiner ... Biscuit joints aren't as strong as other types of joints, but they're perfect if you're making multiple cabinets, a series of bookshelves ...
Wood joints are a traditional method of joining timber. There are a range of different joints that can be used for different situations that provide a variety of levels of strength and structure.
The best dovetail jigs can clamp your project while you cut a strong, stable joint. Upgrade your woodworking shop with a top-rated model.
Woodworkers have always been very clever about making strong and attractive joints — think of the strength ... and even acrylic, although wood seems to be the best application.