when was the first digital computer invented? who invented it?

The first digital computer was the Atanasoff-Berry Computer (ABC), invented in the late 1930s through early 1940s. It was created by John Vincent Atanasoff, a physicist and mathematician, and his graduate student Clifford Berry at Iowa State College (now Iowa State University). The initial version of this electronic digital computer was built starting in 1939 and tested successfully by 1942. John Vincent Atanasoff is widely credited with inventing the first electronic digital computer. The ABC was not a general-purpose computer nor programmable, but it introduced important computing concepts such as binary arithmetic and electronic switching, laying groundwork for modern computing.