Painting on canvas or on panel. What is the difference?
Almost everything can be painted. But here today we will mainly talk about paintings painted on canvas and hardboard/panel.
When it is said that the picture is painted on "canvas", the painter painted on a special canvas that was stretched on a wooden frame. Such an image may or may not be painted on the sides of the image (so called blind frame). Canvas paintings are generally considered higher value paintings.
If it is defined that the picture was painted on "sololite", on "HDF", on "panel", or on "board", then it is important for you to know that the canvas is not there at all. It is almost always the same material with a thickness of about 3-4 mm, which is suitable for painting pictures. However, the picture must then be framed, otherwise you have nothing to hang it on :).
And here we have something in between: canvas glued to a board or cardboard (also about 3 mm thick). Such a picture will also need to be framed, because there is nothing to hang it on the wall.
But I have one good news for you: if you have a picture on board, hardboard and cardboard (these are all "thin" materials), it is possible to go to the store and buy a photo frame, where you can then insert the thin picture after removing the glass. You just have to pay attention to the right size of the image (photo) for which the frame is intended. They have these frames in Hornbach, OBI, or in various hobby shops.
I leave a few examples of the difference in materials in the link on the photos.