What is a 383 Stroker?

I am somewhat familiar with the term 383 stroker but need further clarification.  What exactly is the "383 stroker?"  I understand that the stoke of the piston is enhanced but please explain this to me in better detail, thank you very much!

It's a 350 block that has a crankshaft from a 400 small block installed. That crank gives a longer stroke, or travel, for the pistons, thereby increasing overall displacement to 383ci.

thank you for the explanation!