What type of glue. Is used in plywood?

Plywood is typically bonded using phenol-formaldehyde (PF) glue, which is known for its strong, water-resistant properties. Other types of adhesives used include urea-formaldehyde (UF) and melamine-formaldehyde (MF), which are suitable for interior applications. The choice of glue often depends on the intended use of the plywood, particularly regarding exposure to moisture and environmental conditions.