The classic way to change a background is to cut out the subject, drop in a new image and spend ages matching the light so nobody looks pasted in. AI does it all at once: you write "change the background to a seaside café terrace at sunset", and the model paints a new scene with the right perspective, adjusting light and shadows on the person to fit.
It works for anything: a plain studio backdrop for a résumé or ID-style photo, a beautiful landscape instead of a grey wall, an interior for a product shot, a festive scene for a greeting card. Be specific: place, time of day, weather, mood. Nano Banana 2 keeps faces best, and GPT Image 2.5 follows detailed descriptions precisely and leaves small product details alone.
Your original is never overwritten — every version is saved separately, so you can try several backgrounds and pick the best. Need a transparent PNG with no background at all, for a product listing or a sticker? Use Remove Background. To keep the background but soften it, use Blur Background.