How will Google deal with the two similar website?

[apexis]

How will Google deal with the two similar website? I mean the content of the two sites are similar with each other.

[vizzmedia]

Search engine consider it spam.

[RajSrivastav]

If Search Engines Like Google finds same content on both website, It will penalize the site based on the index status of website which has got indexed first on Google also on Back links