[R] What is "ts" command for?

[Hard Core]

Hello, i'm here to have  an explenation about time series
I have to analize a time series of a stock prices and i don't understand the
meaning of "ts" .. 

i load, for instance 

mps <- get.hist.quote(instrument = "bmps.mi" , quote="Close",
start="2006-01-01", end="2012-09-30", compression="d")

and i get a value mps(zoo) ...

if i run "mps" i get this :
<http://r.789695.n4.nabble.com/file/n4651620/Immagine.png> 

isn't that a time series already? why do i have to transform it with ts or
read.ts?
I don't get the point
Thank you for your availability
Have a good day




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