There are a number of different types of backgrounds that can be removed from photos. The type of background that can be removed will depend on the method that is used to remove the background.
Automatic Background Removal
Automatic background removal tools Photo Background Removing can typically remove simple backgrounds, such as solid colors or plain textures. However, they may not be able to remove complex backgrounds, such as backgrounds with a lot of detail or backgrounds with objects that are similar in color to the subject.
Manual Background Removal
Manual background removal can be used to remove any type of background, including complex backgrounds. However, it is a more time-consuming process than automatic background removal.
Here are some of the different types of backgrounds that can be removed:

Solid Colors: Solid color backgrounds are the easiest to remove, as they can be easily selected using the Magic Eraser tool or the Pen Tool.
Plain Textures: Plain textures are also relatively easy to remove, as they can be easily selected using the Magic Eraser tool or the Pen Tool.
Complex Backgrounds: Complex backgrounds can be more difficult to remove, as they may contain a lot of detail or objects that are similar in color to the subject. However, manual background removal can be used to remove these types of backgrounds.
Transparent Backgrounds: Transparent backgrounds can be created by removing the background from a photo and leaving the subject as a transparent PNG file. This can be done using an automatic background removal tool or a manual background removal tool.
I hope this article has given you some insights into the different types of backgrounds that can be removed from photos. If you have any questions, please feel free to ask me.
Here are some additional tips for removing different types of backgrounds:
For solid color backgrounds, you can use the Magic Eraser tool to quickly and easily remove the background.
For plain textures, you can use the Pen Tool to create a precise selection of the subject and then use the Background Eraser tool to remove the background.
For complex backgrounds, you may need to use a combination of the Magic Eraser tool, the Pen Tool, and manual selection to remove the background.
For transparent backgrounds, you can use an automatic background removal tool or a manual background removal tool to remove the background and then save the subject as a transparent PNG file.