Equivalent airspeed is speed at sea level in which the incompressible dynamic pressure can be produces as if it were at true airspeed. Equivalent airspeed is used to predict aircraft handling.

Yes, it does.

It's an airspeed indicator that compensates for outside temperature and barometric pressure at altitude.

some V speeds are not indicated, It doesn't show true airspeed or ground speed.

Airspeed is speed with respect to the air, i.e. speed through the air.

Groundspeed is speed with respect to the ground, i.e. speed over the ground.

It's the vector sum of airspeed and windspeed.