What is the first molding called on the outside of the vehicle under the window?

The first molding on the outside of the vehicle under the window is referred to as side body molding. This component is designed to enhance the vehicle's appearance and also provide protection against minor dents and scratches that can occur from doors opening or other objects coming into contact with the side of the vehicle. Side body molding typically runs along the length of the vehicle and can be color-matched or contrast with the car's paint, serving both functional and aesthetic purposes.

The other options, while related to vehicle design and functionality, do not accurately describe this specific exterior feature. Edge panels, for example, are usually related to the boundaries of panels or access points, door decals are graphical elements usually applied for decoration or branding, and sills generally refer to the bottom part of the door frame or the area beneath the door, neither of which align with the description of the molding situated under the window. Thus, the identification of side body molding as the correct answer is based on its specific location and purpose on the vehicle.