Transparency Is More Than a White Background
A transparent image lets the layer behind it show through. A white backdrop is still part of the picture.
PNG supports transparent pixels, allowing the background of your layout to show through. Place the downloaded file over a contrasting color to confirm the transparency before using it in a composition.
If your goal is to keep an existing subject and only remove its surroundings, choose direct background removal. Use transparent generation when you want a newly created asset or can accept a generative remake.
Remove the background from an existing image