<picture><source Type="image/webp" | Srcset="http...

: Browsers only download the file type they support and the image size that fits the screen, saving bandwidth. HTML picture element - MDN Web Docs

: WebP files offer better compression than JPEG or PNG, resulting in smaller file sizes. <picture><source type="image/webp" srcset="http...

It is the fallback for browsers that do not support the tag or WebP (e.g., very old browsers). : Browsers only download the file type they