How does ps make white background transparent?

PS processing transparent background is also a kind of matting, and the general methods include magic wand matting, polygonal lasso tool matting, pen matting, channel matting, filter matting and so on. The following steps take "Magic Eraser Tool"/"Magic wand tool" as an example:

The steps to make the white background transparent in ps are as follows:

1. Open the picture, copy the layer, close the background layer, and click the background with "Magic Eraser Tool"/"Magic wand Tool";

2. Press the Delete key to clear the background color;

3. "File-Save As" png format picture, complete.