French doors are a popular double door design.  French doors traditional include glass which allows for light to flow thru the space.  

The most common application for French Doors are:

-Patio Doors

-Closet Doors

-Interior Doors

-Dining Room Doors

-Pantry Doors

-Entry Doors

Key Features of French Doors:
Design: Typically consist of two doors that open from the center, with glass panes set within a wooden or metal frame. The number of panes and the style of the grille can vary.
Glass Options: Glass panes can be clear, frosted, or decorative, providing varying levels of privacy and light transmission.
Materials: Available in various materials including wood, fiberglass, and metal, often with finishes that complement interior decor.
Configuration: Can be hinged or sliding, though traditional French doors are usually hinged.

Benefits of French Doors:

Natural Light: Allow abundant light to flow between rooms, brightening up spaces.
Aesthetic Appeal: Add a touch of elegance and charm to both traditional and modern interiors.
Versatility: Ideal for connecting living spaces, such as between a dining room and living room, or leading to a patio or garden.

Interior French Doors are glass interior doors that are a type of door characterized by multiple glass panels extending for most of their length. They typically come in pairs and are hinged on the sides, allowing them to swing open from the center. French doors originated in France during the Renaissance period and were initially used to allow natural light to enter interior spaces while providing access to gardens or balconies.

Today, they are popular for their elegant appearance and ability to create a seamless transition between indoor and outdoor spaces. They are commonly used as entry doors to patios, gardens, or balconies, as well as between interior rooms to create an open and airy feel.