Image

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JPEG

JPEG is the most common image format used by digital cameras, it is the most common format for storing and transmitting photographic images on the World Wide Web.
Pro

- Small file size

- Widely supported format

- Good color range

Contra

- Lossy compression

- Not great for text, simple graphics, or illustrations

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PNG

PNG was created to improve GIF image-file format. Removing patent license issues at that time; and removing 256 colors limitation.
Pro

- Widely accepted format

- Lossless

- Transparency support

Contra

- Lossless only

- Poor compression for photographic images

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WEBP

WebP is an image file format developed by Google, and supposed to be a new open standard for lossily compressed true color graphics. It's a direct competitor to JPEG.
Pro

- Small file size

- Still great image quality

Contra

- Limited to 8-bit