Hi @Alex Morgillo
Thanks for reaching out.
When you open an image that supports layers, you will see a layer. When you open an image that does not support layers like a jpg, it opens as a background layer. In either case, it is always a photo and can be edited with all the tools available.
Saving as a jpg will merge the layers and give it a white background in any transparent place.
Another commonly used format is png, which supports transparency but does not support layers.
Hope this answers your question; let us know if there's anything we can help you with.