What is the difference between jpg 100 and jpg 20 in terms of image quality and file size?

When comparing JPG 100 and JPG 20, the main difference lies in image quality and file size. JPG 100 has higher image quality with less compression, resulting in a larger file size. On the other hand, JPG 20 has lower image quality due to higher compression, leading to a smaller file size but potentially reduced image clarity.