What
is
а a
sketch ? Answer

A sketch is a drawing that’s a plan. it isn’t a confirmed thought, but it’s a draft.

A Sketch, is traditionally a rough drawing or painting in which an artist notes down his ideas for his work that will eventually be realized with greater precision and detail. The term also applies to brief creative pieces.

They have continued to improve and are still used today.during world war ii there were advances in aircraft and weapons that continue to be seen in military use.  atomic weapons were first created during world war ii, and since then nuclear technology has developed in other ways, including the peaceful use of nuclear reactors for power.radar began to be developed prior to world war ii, but it was particularly during that conflict that radar was fully developed and utilized.  we continue to rely on radar for a number of purposes in today's technological applications -- not only for detection of aircraft, but also by police for monitoring speed of traffic and by meteorologists in tracking weather patterns.computer technology had its beginnings in world war ii with the  code-cracking machine developed by alan turing that was able to decode top secret messages intercepted from the germans.  computer technology has advanced enormously since then, but the work done during the war began the arc of development for much of today's computer technology.those are just some examples.