Solid wood, most of the time. Veneered furniture was found in Egyptian tombs, and lasted 3000 years. Composite panels are more stable with humidity, and a veneered table top makes sense.

Particle board, chip board, osb, mdf, etc are not good for most jointery, but can hold screws. Not BIFL.

Lumber and veneer core plywoods can be BIFL. The durability and reliability of these panels vary widely, and the labels don't say. Major furniture manufacturers can custom order their own panels to the performance they want: glues used, glue qty, press time, veneer species & orientation, veneer thickness, et cetera.