As you may know already, Dark and light themes are kind of the most generic descriptions for a theme style. So on this article, we’ll cover some pros, cons, and things to consider when making either style.

Dark Themes

When a theme is dark? Well, it really depends. But in general, when you use dark backgrounds on considerably important sections of the theme, it will be a dark theme. At least, that’s how I take it. Usually the typo is a light color.
Black is usually considered to represent elegance. Though, be carefully about the complementary colors you use.
Dark themes are more commonly hard on the eyes, this might be a usual mistake with a dark theme.

Light Themes

Well, I guess a light theme is easier to identify. We could say it’s the opposite of a light theme (at least when it comes to color usage), it usually involves pastel backgrounds and typo could vary from dark to light colors.
A light theme provides a sense of amplitude to your site (of the same nature white provides).

Both?

Some times, it might be very hard, (and perhaps impossible) to identify a theme under this generic parameters. You can take advantage of both main color schemes to make a very neutral theme.