Microsoft Paint, also known as MS Paint or Paintbrush is is a simple raster graphics editor that has been included with all versions of Microsoft Windows. The program opens and saves files in Windows bitmap (BMP), JPEG, GIF, PNG, and single-page TIFF formats. The program can be in color mode or two-color black-and-white, but there is no grayscale mode. For its simplicity and that it is included with Windows, it rapidly became one of the most used applications in the early versions of Windows, introducing many to painting on a computer for the first time. It is still widely used for simple image manipulation tasks.
MS Paint is generally seen as an absolute joke in the world of graphics editing and digital art, because its features are extremely limited and feels like a program from two decades ago despite being updated over the years. You might as well just use Paint.net or GIMP which are both free and significantly better.
Despite this, MS Paint has made its way in the MECU throughout the years such as through animations or graphics. Sadly, we can't honestly admit that it was only used ironically.