Why it matters.
It offers a quick path from capture to a usable file.
A closer look.
The camera applies choices such as white balance and tone rendering before saving its JPEG. Lossy compression reduces file size while discarding some information.
Picture this
Make a JPEG export for sharing while keeping the original capture as your editing master.
Keep in mind.
Strong later adjustments can expose limited tonal information. Lossy compression can degrade sharp edges and smooth colour transitions.