  The Large Hadron Collider (LHC) experiment has successfully completed data
taking at center of mass (COM) energy 7 TeV in 2011 and very recently for 8
TeV. Measurement of cross sections predicted by the standard model were the
main tasks in the beginning. The inclusive jet cross section and dijet mass
measurement is already done at 7 TeV energy by Compact Muon Solenoid (CMS)
detector with integrated luminosity 5 fb$^{-1}$. In these measurement one needs
to understand and measure precisely the kinematic properties of jets which
involve many theoretical and experimental issues. The goal of this article is
to discuss all these issues including jet measurements in CMS and subsequently
review the inclusive jet cross section and dijet mass measurement in CMS at 7
TeV with integrated luminosity 5 fb$^{-1}$. The measurements, after unfolding
the data, are also compared with the next leading order (NLO) theory
predictions, corrected for the non-perturbative (NP) effects, for five
different sets of parton distribution functions (PDF). It is observed that the
measurements, for both cases, agree with the theory prediction within
$\sim$8-10% depending on transverse momentum ($p_T$) and dijet invariant mass
($M_{jj}$) of jets.
