here are a lot of websites on the internet, and if you take the time to go through them, you'll notice that the percentage of websites with a white background is quite high. The reasons for this are quite varied: however, there have doubtlessly been people who have opted to use a plain white background simply because their ubiquity and popularity makes it seem like they're automatically the best for any given project, and that's not always the case.
This is why we're drilling down into some of reasons (both simple and complex) of why web designers often gravitate towards a white backdrop. Understanding those motivations and design choices can help you determine whether going all white is right or wrong for your project.