PNG offers certain qualities that professionals can’t ignore.
If you’re just moving a few pictures of your house or something like that, you don’t need to use a PNG. The difference in image quality will not be substantial. But if you need one of those images resized, it might be more important.
PNGs are substantially larger files. In many cases, they are 200% to 250% larger. The images themselves are also larger. There is one huge reason for this that professional considerations require: how colours are displayed.
A JPG compression will do a few things. One of those things is reducing the size by “assuming” that your human eye won’t be able to detect the differences between similar colours. Pixels of similar colours are thus grouped together to save space. This is a highly intelligent process if you’re being utilitarian. It’s why if you’re just storing photos or simple documents, JPG is the winner.
Of course, PNG compression doesn’t require these sacrifices. Despite that, PNG saves some space over JPG when it comes to simple images. Documents or infographics with just a little bit of colour are often smaller when saved with PNG. But when it comes to photographs, PNG is the better file type for storing illustrations.