Betelgeuse, in the constellation Orion, is one of easiest stars to spot in the night sky. It's bright, it's enormous and it could explode at basically any time.
As stars go, it's on its last legs. Astronomers aren't sure how much longer it has. It could go supernova tomorrow or 100,000 years from now.
The shock wave will be so huge, it could reach our solar system, but it'll have to travel 640 light years to get here. By that time, it'll be so weak, it will basically bounce off the solar wind that our sun emits. It won't even reach Earth.
And it won't outshine the sun, but it will get a lot brighter. It will be like having a second full moon in the sky — for several months.