Which image file format allows for transparency and is often used in graphics like airplane and car designs?

The image file format that allows for transparency and is commonly used in graphics like airplane and car designs is the PNG format. PNG, which stands for Portable Network Graphics, supports alpha channel transparency, enabling images to include varying levels of opacity. This feature is particularly beneficial in design scenarios where overlays or layered compositions are needed, such as in 3D modeling, web design, and high-quality graphics presentations.

Unlike formats such as JPEG, which does not support transparency, or BMP, which can be quite large and does not offer any form of compression, PNG provides a balance of high-quality imagery along with the ability to render transparent areas seamlessly. This makes it ideal for creating clean, professional graphics that can be easily integrated with other elements without unsightly backgrounds. GIF, while supporting transparency, is limited to a palette of 256 colors, making it less suitable for high-quality graphics compared to PNG.