In more detail
It has no transparency and handles sharp text poorly, adding halos. Each re-save recompresses, so edit first and export once. Its files start with the bytes FF D8 FF.
Glossary
Design & Media
JPEG
JPEG is a lossy image format designed for photographs that makes small files by discarding detail the eye is least likely to notice.
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See also
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Glossary
PNG
PNG is a lossless image format with transparency, well suited to screenshots, logos and graphics with text or flat colours.
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Glossary
WebP
WebP is a modern image format from Google that supports lossy and lossless compression.
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Guide
How Image Formats and Compression Work
JPEG, PNG, GIF, WebP, AVIF, HEIC and SVG compared with measured file sizes, lossy versus lossless, aspect ratio and print maths.