Create the transparent area
Upload the source image to a background removal tool and let it separate the subject. Download the result as PNG so the transparent pixels are preserved. JPEG does not store alpha transparency.
Check that transparency is real
Open the file in an image editor or place it over a colored layer in a design tool. If you see a solid white rectangle in every viewer, the file may have been flattened. Some file browsers show transparency against white, so appearance alone can be misleading.
Use the cutout where it fits
Transparent PNGs work well in slides, product layouts, and graphics where the background may change. Review edges and dimensions before publishing; transparency does not repair blur, compression, or missing detail.