Basically, the mutation spreads more easily, but isn't supposedly any more deadly.

https://www.washingtonpost.com/science/2020/06/29/coronavirus-mutation-science/?arc404=true&fbclid=IwAR3M-745t3ce-FTUa8bkxNmQCUwm7BwPSsjtN0kPtUJbY1KSUJ7H20cSYCM