  Fe-based superconductors were discovered in 2008. This discovery with T$_c$
values up to 56 K, generated a new belief in the field of superconductivity.
Till its discovery, high temperature superconductivity in cuprates, created a
prejudice that Cu-oxides are essential building blocks for a high temperature
superconducting material. These Fe based superconductors do not contain Cu-O
planes (some of the materials are even O free). It will be argued in this
review, that these iron pnictide and chalcogenide (FePn/Ch) superconductors
have Fe electrons at the Fermi surface together with an unusual Fermiology that
can change rapidly with doping. This may lead to very different normal and
superconducting state properties compared to those in standard electron-phonon
coupled {\it conventional} superconductors. There are a large number of
evidences showing that superconductivity, magnetism, orbital fluctuations are
intimately related and coexist in these materials although the mechanism of
superconductivity in these compounds is still unknown. The electronic specific
heat, $\frac{2\Delta}{k_B T_c}$ ratio, phase diagrams, isotope effect, crystal
structures and there correlation to T$_c$ from various available experimental
data are main inputs of this review to show the above.
