Microsoft

windows is a widly used os (operating system)

the windows logo has changed over time
in 2001 it was a wavy red green blue and yellow. in 2006 it was still wavy and red, green, blue, and yellow but with a blue circle around it. next, in 2009 still wavy, and no circle but it was shinier. and in 2012 it was a flat series of 4 blue rectangles.