Refer to figure.
Gas Turbine Engines - compressor section
The compressor section of the engine has the important task of providing a sufficient quantity of compressed air to satisfy the requirements of combustion. It increases the pressure of the mass of air that is received at the inlet and provides it to the combustion section at the required pressure.

An axial compressor contains multiple stages of a ring of rotor blades, which are spinning, followed by a ring of stator blades, which are stationary guide vanes.

The rotor blades are spun by energy harvested in the turbine at the back of the engine, and they increase the pressure and velocity of the air, giving some of their kinetic energy to the air in the form of potential (pressure) and kinetic (velocity) energy.

The stator blades which follow are used to decreased that velocity back down again, and in doing so, convert that velocity into further increased pressure. They also have the job of “straightening out” the airflow inside the engine so it hits the next rotor stage at the correct angle.

Therefore, the stator increases the air's static pressure and static temperature (these two always move together when only expansion/compression occurs), and decreases the air's velocity.