A concealed hinge, also known as a European style hinge, is a type of hinge that is installed within a cabinet door to create a smooth outer appearance. It allows for easy adjustment of cabinet doors and simplifies the removal of doors. There are three styles of concealed hinges: full overlay, half overlay, and insert, with full overlay being the most common in kitchen cabinetry. Concealed hinges offer advantages such as improved security, easier clean-up, and the ability to add self-closing to cabinet doors without a visible frame.