Wood is a porous material, and as a result it can be joined with resin, polymer and water based adhesives.
Sometimes wood joints and glue are combined to make a stronger 'frame' or join.
The most commonly used glue is PVA which requires wood to be clamped together while the glue sets, usually within a few hours.
Cascamite is a resin-based powder which is mixed with water into a ‘milk-like’ consistency and is ideal for laminating and veneering as the thinner consistency makes it easier to spread on large surfaces.
Gorilla Glue is a modern and extremely strong adhesive which requires both surfaces to be wet before being clamped together. Over the next few hours the glue expands like a foam to provide a very strong joint.