Selective color is a post-processing technique where most of a photo is converted to black and white, but some parts are left in color. This is usually achieved by using layers and masks in photo editing software. Black and white photography can give very powerful meaning to a photo, but sometimes a bit of color makes it truly outstanding.
The selective color technique emphasizes parts of the photo and draws more attention to the subject. It can turn your plain photo into a real work of art.