What machine is considered by many to be the first all-programmable electronic digital computer?

The machine is called Colossus worked by Thomas Flowers in the year 1943. Colossus was the world's first programmable electronic computerized PC. English codebreakers utilized Colossus to peruse German coded radio messages amid World War II. Their plan, which was called "Goliath" utilized many vacuum tubes. The main machine, Mark 1, worked in December 1943.