What animal/insect is this?
It is an insect of family Chrysopidae under the order Neuroptera (net-winged insects).
The insects of this family are commonly called Green lacewings.
Neuropterans have large lateral compound eyes, four wings and a generalised pattern of veins.

(Source: Wikipedia)
Identifying morphological features:

Soft-bodied insects with copper-colored eyes, long thread-like antennae, and lacy wings.
Most species are green, but some are brown, especially overwintering adults of certain species

( Reference: Bugguide ) 
A similar family of lacewing, Hemerobiidae also exists which are brown, have rounded smaller wings and found throughout the world.
Here's a link to wikipedia showing the phylogeny of the Neuroptera as explored using mitochondrial DNA sequences: link .