JPG (JPEG) is the most widely used image format, created in 1992. It uses lossy compression to shrink photos up to 10× smaller than PNG or TIFF while keeping visual quality high. Every browser, OS, and image editor supports JPG natively.
However, text inside a JPG is baked into pixels, so you cannot select, copy, or edit it. Converting JPG to Word with OCR extracts that text into an editable document. PNG, TIFF, BMP, and WebP images work the same way.