Teal is a mixture of blue and green. It can be mixed with white to make it lighter or with gray to make it darker. At its brightest, it has a yellow undertone and is very close to turquoise, and at its most muted, it more closely resembles a green slate.
Teal pops with bright white, and its color wheel match is coral. But it also works with cream, navy, pinks and especially gold and brown tones. It’s a classic that works with nearly any style, from eclectic to traditional.
If you want a dark blue-green then it would be teal; a bright, medium to light tone with more blue than green is turquoise; and a soft color that is often called Tiffany blue is Aqua.