What is the meaning of four color dots in newspaper?

CMYK--Cyan, Magenta, Yellow, Kalos(Black). These 4 color dots or sometimes the CMYK alpabets itself in their respective colors are printed at the bottom of the every page of newspaper. The 4 colors represent the 4 cartridges, the metered quantity thereof mixed in various ratios can render different colors. The protocol of printing the 4 individual colors at the end of the page is  a test of serviceability for the 4 cartridges; in a sample if any of the cartridges 
fades out, the quality of the previously printed color images would be severely traded off.
Those four colors -- cyan, magenta, yellow black (known as CMYK in four-color process printing) -- are the base colors for creating all the colors you see in print. They are each laid on the page separately by individual plates or films. To print a crisp and accurate full-color photo, the four plates/films, must be lined up on the page in the same spot (you will often see what looks like a plus sign in the registration marks as well, and this is the guide used to line up the corners of the plates/films). If you ever see a page make it to print where the photos are blurry or the color seems "off" (too red, too yellow, etc) you can usually look at the registration marks and say "Ah, the cyan plate wasn't aligned and the yellow wasn't printing properly!"