What file type is commonly used for images in CodeHS?

The commonly used file type for images in CodeHS is JPG (Joint Photographic Experts Group). This format is widely recognized for its ability to compress image files while maintaining a reasonable level of quality. It is particularly suitable for photographs and graphics where a balance between image fidelity and file size is important. JPG files can display millions of colors, making them ideal for colorful and complex images, which is why they are frequently leveraged in web development, game design, and other digital applications.

Other file types mentioned may serve different purposes; for example, PDF is typically used for documents that need to be printed or shared while preserving their original formatting, DOCX is associated with word processing documents like those created in Microsoft Word, and TXT is a plain text file format with no formatting or images. Therefore, JPG stands out as the go-to choice for image formats in environments such as CodeHS.