Technically the first computers were (mainly) females who were good at maths and were put forward to compute maths tables for the navy. In fact the reason that

Technically the first computers were (mainly) females who were good at maths and were put forward to compute maths tables for the navy. In fact the reason that we call (modern) computers by that name is because they are named after the original humans who did the job. In fact Babbage worked on the calculation engine(s) precisely to aid in the automated calculations that they would be providing, including identifying several corrections in log tables that were printed around that time. https://en.m.wikipedia.org/wiki/Human_computer https://en.m.wikipedia.org/wiki/Human_computer The first electromechanical computers were arguably the Lorenz machine (reconstruction at TNMOC next to Bletchley Park) and the Bombe (a reconstruction of which is available at Bletchley park). The first electrical only computer was ENIAC, though you tend not to hear about these from American historians as some of these facts were classified until (relatively) recently.