It came as a clear favorite with the viewers during the voting, and consequently Texas Lightning went on to represent Germany in the ESC. As Germany is one of the four biggest contributors to the EBU (organiser of the contest), their entries go straight to the final.
Texas Lightning garnered significant support from voters and thus qualified to represent Germany at the ESC. Given that Germany is one of the top four contributors to EBU (the event's organizers), their submissions are directly entered into the finals.